Best Aquarium Thermometers for Optimal Fish Keeping and Maintenance

The art of fish keeping encompasses several elements, but among them, aquarium temperature is one factor that is often misunderstood or disregarded by aquarists. The temperature of an aquarium might not be stealing the spotlight when it comes to proper fish tank maintenance. However, it is a solid backbone that keeps the domestic ecosystem within the tank stable and healthy. Most beginner fish keepers struggle with the dilemma. Why so much stress on aquarium temperature and invariably on aquarium thermometers, when the natural aquatic habitats don’t need one to ensure that the scale remains constant at all times?

We keep insisting on aquarium thermometers because, unlike your aquarium, the quantity of water in natural aquatic systems is colossal. Meaning, the temperature changes are slow and gradual, allowing life within to adapt to the alterations. In fish tanks, the temperature swings are rapid; the water can quickly cool down or heat up, depending on the external environment’s temperature.

Your fish tank inhabitants are not used to these sudden temperature fluctuations, as these animals are incapable of regulating their internal body temperatures, unlike you and me. Even the slightest temperature change affects the fish growth aquarium.  As a fish keeper, what thermometer to use for water in fish tanks is quite a critical piece of knowledge to maintain an optimal temperature range in the aquarium. You might install a heater in your aquarium, but how do you know that the temperature within is at an optimal range? By installing an aquarium thermometer, you can collect real-time data and prevent blunders that would surely happen in the device’s absence.

With so many products on the market, it is difficult to figure out the right specifications or what kind of thermometer to measure water temperature is the most accurate! This is where we can guide you with detailed aquarium thermometer reviews, a buying guide, and some other useful aquarium maintenance tips. But before we touch on that, let’s understand a bit more about the association of aquariums, different fish species, temperature ranges, and fish tank thermometers.

Why is the aquarium thermometer necessary?

An aquarium heater might be a sure item on your list for your fish tank setup. But you are missing one more piece of equipment, without which using a fish tank heater is a hopeless measure. Maintaining an aquarium fish temperature chart is a smart way of identifying any fluctuations or imbalances in the fish tank’s water, which will help prevent a worst-case scenario for your fish and help the aquarium thrive. Here are a few more reasons why you should consider measuring water temperature in an aquarium thermometer.

·         Aquarium fish and other invertebrates indeed are incapable of maintaining a stable temperature on their own

The right temperature of water in an aquarium is an essential parameter for your fish to be able to carry optimal homeostasis at all times. So, the question is how to keep the aquarium temperature stable? By using an aquarium thermometer, simple, eh! Constant water temperature in the tank is the line that marks a healthy aquarium from the one that is most likely to crash and cause harm to the fish when you are not paying attention. 

As the temperature fluctuates, it causes stress to your fish, compromising their immune system putting them at risk of diseases such as fin rot and piscine tuberculosis. As the temperature for aquarium fish keeps on stumbling off track, your fish eventually succumb. And the disaster is not just exclusive to the aquarium fish; it also kills the aquatic plants and other microbes that are vital for sustaining a proper cycle in the tank.

By sticking in the aquarium thermometer in the tank’s water routinely, you can fix the inconsistencies before they turn into a very sour pickle that you can’t handle. An aquarium thermometer becomes even more essential when you conduct partial or complete water changes. The aquarium temperature change during water changes requires special monitoring, supplemented with a reliable heater; you can bring the water to the right temperature to enhance the ecosystem before adding the fish. 

·         A Broken Heater Spells D-I-S-A-S-T-E-R

 Once you have mastered aquarium water temperature measurement using a fish tank thermometer, your heater is sufficient to match the optimal requirements within the tank. But what happens if the water temperature gets too warm or too cold in an aquarium? The suspect behind this isolated incident is your malfunctioning aquarium heater. By jotting down the daily units in your aquarium fish temperature chart, an aquarium thermometer can warn you beforehand, saving your fish from boiling up and dying. Another good habit to prevent heater malfunctioning is to take your aquarium heater for routine check-ups and clean it once in a while with chlorinated water.

·         The good bacteria in your tank require specific temperature ranges.

Aquarium water temperature for bacterial growth is a critical factor for the internal ecosystem. If you are beginning with a new fish tank, the recommended temperature for aquarium cycling is between 86-95 Fahrenheit when the nitrifying bacteria show the highest activity rate. If you are wondering at what temperature aquarium beneficial bacteria die? Any temperature fluctuation above or below 86-degree Fahrenheit can kill the good bacteria, hampering the cycling process.

On the other hand, specific temperature ranges can supplement the growth of bacterial parasites within the tank. This further stresses the importance of aquarium thermometers. By testing your fish tank temperature, you can quickly help your fish combat the pathogens. One of the most common parasitic infestations in aquariums is a ciliate protozoan – Ichthyophthirius multifils, more commonly called as ‘ich’ or ‘ick.’ when you begin to see some white spots on the fins of your fish, it is a clear indicator that the poor animal is infected by ich. If you want to troubleshoot the problem, you first need to figure out – what is the temperature for my fish tank freshwater with ich? Typically, ich thrives and proliferates well at a temperature range of 72 to 77 degrees Celsius. When that happens, we highly recommend that you safely increase aquarium temperature to 86-degree Fahrenheit.

Learn more about Aquarium Heaters- Read Here

What are the most optimal temperature ranges for different types of aquariums?

Figuring out the ideal temperature for an aquarium can be a tricky ordeal for many fish keepers. Generally, saltwater fish that come straight from ocean bodies or huge lakes are less tolerant of temperature fluctuations. To give you a better idea of – what temperature should a freshwater aquarium be or even a saltwater fish tank, here is a little fish temperature chart aquarium that will help you cut back on a bit of reading time.

What is the optimum temperature for a freshwater aquarium?

If you are wondering what temperature a fish tank should be for freshwater fish? The best freshwater temperature range is between 73 to 84-degree Fahrenheit.  Most fish keepers aim for 77 degrees Fahrenheit as it is not too hot or too cold, just right.

Essentially the range depends on what types of fish you are stocking in your tank. Generally, for breeds like gobies and betta fish thermometer scale bend on the warmer side, while the ideal temperature for goldfish aquarium is comparatively on the cooler spectrum on an aquarium thermometer.

Sr. NoFreshwater FishTemperature Ranges
 1Betta or Siamese Fighting Fish76 to 83 Fahrenheit
 2Goldfish71.6 to 80.6 Fahrenheit
 3Angelfish60 to 86 Fahrenheit
 4Guppy Fish78 to 82 Fahrenheit
 5Mollies78 to 78  Fahrenheit
 6Rainbowfish74 to 78 Fahrenheit
 7Dwarf Barbs (Golden)68 to 72 Fahrenheit
 8Platies70 to 77 Fahrenheit
 9Neon Tetra75 to 80 Fahrenheit
 10Zebra Danios65 to 77 Fahrenheit
 11Killifish68 to 75 Fahrenheit
 12Pleco fish72 to 78 Fahrenheit
 13Minnow75 to 75 Fahrenheit
 14Dwarf Gourami75 to 80 Fahrenheit
 15Africa Cichlids78 to 82 Fahrenheit

What temperature should I keep my saltwater aquarium at?

Dealing with saltwater aquarium thermometer readings is not the most straightforward thing you will do in your fish keeping hobby. Bringing down your dilemma of what temperature should my saltwater aquarium be- cannot be compartmentalized into a single range. These fish species have very particular requirements when it comes to the type of ecosystem they thrive in. However, If we had to put a safe range, maintaining saltwater aquarium temperature at 79-degree Fahrenheit is a great middle ground.

Sr. NoSaltwater FishTemperature Ranges
 1Tangs75 to 82 Fahrenheit
 2Damselfish72 to 78 Fahrenheit
 3Chalk Bass72 to 78 Fahrenheit
 4Watch Goby70 to 80 Fahrenheit
 5Dottyback77 to 81  Fahrenheit
 6Clownfish72 to 78 Fahrenheit
 7Firefish71 to 77 Fahrenheit
 8Coral Beauties74 to 82 Fahrenheit
 9Talbot’s Damsel73.4 to 78.8 Fahrenheit
 10Wrasses80 to 80 Fahrenheit
 11Cardinalfish72 to 78 Fahrenheit
 12Blenny Fish75 to 80 Fahrenheit
 13Butterfly Fish72 to 78 Fahrenheit
 14Green Chromis72 to 82 Fahrenheit
 15Longnose Hawkfish75 to 79 Fahrenheit

Different Types of Thermometers

1.    Floating Aquarium Thermometers

The glass floating thermometers are placed in such a way that they are in direct contact with the aquarium water. Meaning you are more likely to get an accurate temperature reading on this type of aquarium thermometer than any other kind. You can mount the floating thermometers in many different ways, but the most common trick is to use a suction cup to stick the unit on the inside wall of the fish tank at the aquarium gravel level. However, if you are looking for an aquarium suction cup alternative, you can also use a clip to hang the aquarium’s floating glass thermometer.

The most significant downside of this type of aquarium thermometer is that they are entirely made up of glass, meaning they do break relatively quickly among the three types of thermometer mentioned. Glass floating thermometers are reasonably inexpensive and give accurate temperature readings. Moreover, unlike the stick-on thermometers, they are not influenced by external temperature.

2.    Digital Aquarium Thermometers

Let’s face it; modern technology adds that kick of convenience to any equipment, and the digital aquarium thermometer is one such convenient option for fish keepers. Well, this type of thermometer does need a relatively higher investment than traditional fish tank thermometers. Still, the bells and whistles you get are often worthy of pitching in a couple of extra bucks. The best digital thermometers are known to be accurate and durable. These devices are almost always supplemented with water temperature probes and LCD aquarium displays. You will find both varieties of the wireless ones and digital thermometer with a wired probe. Most of the units are fueled with batteries.

Some submersible digital thermometers can be mounted in a manner that the water temp probe is constantly underwater to give you accurate readings at any time of the day. While others also sport an aquarium temperature alarm, which will notify you when the water betrays the ideal temperature aquarium range or reaches it.

If you wish to ensure that the product you purchased is undoubtedly the most accurate aquarium thermometer, you follow this short video guide

3.    Stick on Aquarium Thermometers

The Stick-on Aquarium thermometer is another simple and one of the most commonly used fish tank temperature measurement devices. You will often find them within the new aquarium packages. This stick-on thermometer for the fish tank is also known as an LCD thermometer, and often they are misadvised as digital thermometers. However, if you see a stick-on digital thermometer in any the description of a product you are about to purchase, we recommend rechecking the specifications. Although stick-on aquarium thermometers are commonly used by fishkeepers, they are nowhere as precise and accurate as of the digital fish tank thermometers.

LCD thermometers are relatively inexpensive and make for versatile equipment, hence their popularity. Some aquarium stickers also come with dual temperature scales viz. both Fahrenheit and Celsius. If you hope for accuracy, you would be disappointed as these LCD thermometer strips give you a temperature range rather than specific units. They are also easily influenced by external temperature and weather conditions as they can only be placed outside the fish tank. You need to take extra precautions while positioning the fish tank thermometer sticker. Make sure you are keeping them away from direct sunlight. It is also not advisable to place them at the aquarium substrates level as the water flow in that region is slow and tardy.

Best Aquarium Thermometers

1.    Fluval Wireless 2-in-1 Digital Aquarium Thermometer

Fluval Wireless 2-in-1 aquarium digital thermometer is one of the most suitable options on the market. It is structured for better convenience with its robust mounting mechanism and large digital temperature displays. This digital thermometer with LCD display that is nothing less than excellent has one noticeable disparity. Fluval Wireless fish tank thermometer does not have an aquarium temperature probe. This directly translates to a slight fluctuation from the original aquarium water temperature as the thermometer’s entire body sticks out of the tank’s water. The missing aquarium thermometer probe is not much of a problem if you have fish that has a broader tropical fish tank temperature range.

The Fluval aquarium thermometer makes for such a fantastic fish keeping equipment because you simply have to glance at the large LCD thermometer display to detect any problems or ensure temperature stability. Overall, the price of the Fluval wireless aquarium thermometer is reasonable considering the features and convenience it brings to your fish keeping endeavors.

Pros

  • Perfectly sized small thermometer for easy installation in both large and small tanks
  • Sturdy mounting
  • Large aquarium LCD display for easy viewing
  • Affordable

Cons

  • The absence of an aquarium temperature probe might cause slight inaccuracy.

Our verdict

If you are looking for a budget aquarium thermometer with a fantastic display, the Fluval 2-in-1 wireless thermometer is your best bet. We do recommend keeping a backup fish tank thermometer to check the accuracy of the product from time to time. 

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2.    Marina Floating Aquarium Thermometer with Suction Cup

The Marina floating thermometer is the perfect example to support the sentiment- not all good things for a great fish keeping experience are expensive. The floating glass thermometer stands at 4.25 inches, which is exactly right if you want to use it to control the temperature in a small aquarium. By a floating glass thermometer, we mean the most traditional design for an aquarium thermometer- a straightforward yet efficient approach to correct and maintain fluctuating water temperature aquarium.

You will find a green area on the glass floating thermometer, which is the safe space that indicates a stable temperature in your aquarium. Although you’d have to look harder to take your temperature readings when compared to modern LCD thermometers, the green line is enough of an indication to tell you if all is well in the tank. Now yes, the Marina floating thermometer- well, floats, but it also comes with suction cups that you can use to mount the product on the wall of your tank. 

The only disparity that we found is that the glass floating thermometer has a rather delicate body. If you handle the equipment gently, there is no doubt that this aquarium thermometer gives you the most accurate readings compared to other modern digital fish tank thermometers.

Pros

  • Accurate temperature readings
  • Extremely affordable
  • Comes with a suction cup for easy mounting
  • Greenline indicator for more comfortable viewing

Cons

  • This is a small thermometer, meaning you will have to strain your eyes a bit to chart down the readings
  • The delicate body of the floating glass thermometer needs gentle handling

Our verdict

The classic design of the Marina floating thermometer ensures accuracy. Although the size is small, you simply have to pay attention to the green line indicator to make sure that the temperature in the tank is stable for day-to-day usage. For the insanely small price point, this aquarium thermometer is a fantastic purchase. 

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3.    Cooper Atkins DFP450W-0-8 Waterproof Reduced -Tip Digital Aquarium Thermometer

Cooper Atkins Aquarium thermometer has made quite a name in the fish keeping community. It is durable, accurate, and one of the best contenders as the best digital water thermometers on the market.  Although the product is not designed to act precisely as an aquarium thermometer, the waterproof digital thermometer probe means it is perfectly safe to be used in the tank’s water. The mounting is simple and straightforward. You simply have to switch it on, stick in the fish tank water, and within five counts, which totals to six seconds, you have the most accurate digital thermometer readings.

The waterproof digital thermometer probe has a temperature range between -40 to 450-degree Fahrenheit. Meaning it is enough to cover the fish tank temperature to any highs and lows. The package comes with batteries included besides the main product. The waterproof digital thermometer probe batteries last for a whopping 500 hours of total usage time. Since you get a confirmed guarantee from the manufacturer on the digital thermometer accuracy, there is no need to conduct the Cooper thermometer calibration.

Another striking feature is that this is a probe thermometer with an alarm, meaning you also set the temperature, and the alarm goes off when the count reaches the preset unit. The perfect accuracy, waterproofing, digital LCD display, and the water temperature alarm makes the Cooper Atkins aquarium thermometer an excellent bang for the buck buy.

Pros

  • Extreme digital thermometer accuracy
  • Convenient and easy to use
  • Digital display for easy viewing
  • Waterproof
  • Comes with a water temperature alarm

Cons

  • Can be expensive if you are looking for a budget-friendly option
  • Although waterproof, it cannot stand permanent submersion in the aquarium water.

Our verdict

The Cooper Atkins digital water thermometer is excellent if you want a piece of equipment that will last long. It is also infamous for being the most accurate digital thermometer in the market. When bundled with its customizable water temperature alarm and ability to process the results quickly, we are sure you will not regret this purchase during your fish keeping endeavors. 

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4.    Zacro Digital Aquarium Thermometer Fish Tank Water Terrarium Temperature

The Zacro LCD thermometer is your middle ground if you are looking for a durable thermometer but also have a budget to follow. The crisp and clear LCD screen in the most striking feature of this product. The digital probe thermometer with LCD display can read temperature accurately with a slight consideration of +/- 2-degree Fahrenheit.

You can use the aquarium suction cup to mount the Zacro aquarium thermometer, with its water temp probe sticking below the water level. As we always recommend for a digital fish tank thermometer, keep a second thermometer handy to check for the accuracy of the main product from time to time.

You can choose between both Fahrenheit and Celsius units on the LCD aquarium thermometer display. The product comes along with LR44 batteries, eliminating the hassles of arranging wires to reach the power sockets. With convenient usability and a robust build, the Zacro digital thermometer for the fish tank is a great product.

Pros

  • Gives accurate temperature reading
  • Sturdy mounting via suction cups
  • Dual temperature units on the LCD thermometer display
  • Battery operated
  • Affordable

Cons

  • You might have issues with the suction cup after a while

Our verdict

Considering the numerous bells and whistles on the product, the Zacrodigital aquarium thermometer is a fruitful purchase. You get to choose between Celsius and Fahrenheit units, which is quite a convenience for fish keepers in different parts of the world using different temperature standards. Moreover, the product is durable and offers a great digital aquarium thermometer accuracy for a budget-friendly price. 

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5.    American Thermal Horizontal Aquarium Thermometer

There is a lot of stigma around stick-on thermometer strips, but the American Thermal Horizontal aquarium thermometer will not disappoint you. Of course, the accuracy is not as good as a submersible digital thermometer or a calibrated device, but the optimum aquarium temperature range is closely displayed. If you are not much of an aquarium temperature reader, this device will complement your fish keeping. It is relatively easy to make a fish tank temperature chart as the green illuminated region is the proper temperature. The red-light region indicates that the range has dropped a degree lower than the ideal temperature range.

The product offers a good deal as three thermometer strips merely cost $10. As a straightforward and easy to use aquarium thermometer, it makes for good equipment to control and maintain optimal aquarium temperature range at all times.

Pros

  • Convenient and simple to use
  • Illuminated display in different colors
  • Robust mounting
  • Perfectly size as a small thermometer
  • Affordable

Cons

  • As the product is not submersible, it does not offer digital thermometer accuracy.

Our verdict

The American Horizontal Thermal aquarium thermometer does not require an extra power supply. Moreover, the mounting is moveable, and the display is quite apparent with the different light that illuminates different temperature situation in the tank. It is undoubtedly a great option for the price and convenience as an aquarium thermometer for beginner fish keepers.

Rating

4.2/ 5

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Buyers Guide

·        Mounting and Installation

Learning how to use and read aquarium temperature is pretty simple once you have a good guide to follow. Your entire experience with the device depends a lot on its setup, which is quite a complicated ordeal when it’s your first attempt at it. Stick-on thermometers that generally come along with your new aquarium kits typically stick to the outer glass wall of your fish tank.

Floating glass thermometers are placed in such a manner that they are in close contact with the aquarium water. Some models might even come as submersible aquarium thermometers. While most have a suction cup for mounting, if you are looking for an aquarium suction cup alternative, you can find them as clips. The deal is to keep them on a sturdy mount, which is enough for the humble glass floating thermometer.

The digital aquarium thermometer can be essentially divided into the digital LCD display and an aquarium probe. The probe dips in the water, while the digital aquarium display is kept dry, above the tank’s water level. If the aquarium thermometer is wired and needs a power outlet, you need to pay extra attention to the mounting and the reach. The best aquarium thermometers are those that are easy to install, and the mounting lasts for a long time. Depending on the type of aquarium you are maintaining, the choice can vary. 

Accuracy and the Covered temperature range

Aquarium thermometer accuracy is a critical factor when it comes to making the right choice. The slightest of temperature fluctuations can cause significant stress to your fish and aquarium plants. Hence, the most accurate fish tank thermometer is also the most desirable one. 

Out of the three types of thermometers we have mentioned, the stick-on thermometer is considered the least accurate. They are easily influenced by external temperature changes and weather. The digital thermometer accuracy is undoubtedly on point, with the floating glass thermometers taking the second place.

Durability

Durability is another vital consideration for aquarium thermometers. The material that is used to structure the product affects its sturdiness and life span. A fish tank thermometer must consistently deliver accuracy and should be able to last long enough to give a desired return on the purchase; that is how we determine if a product is worthy of being deemed as the best aquarium thermometer. Spending a little more on a high-quality material for the aquarium thermometer is a good decision. After all, you don’t want to buy a cheap device while leaches all its toxic contents into the water. That’s perhaps the worst fish keeper nightmare. Floating thermometers are made up of glass. If you have active fish breeds in the tank, it is probably not a good idea to install a floating glass thermometer. You can go for a digital thermometer or a stick-on thermometer strip for extra caution.

Readability

Keeping an aquarium fish temperature chart is an everyday job for fish keepers, meaning a fish tank thermometer’s readability can make or break your experience. Let’s face it; we can’t deal with tiny temperature displays that are not only stressful for your eyes but also create room for misreading. There is a lot at stake, after all. Stick on thermometers have differently colored regions to indicate an ideal aquarium temperature range or a drop. Digital thermometers are even more convenient with their large aquarium LCD displays. Some upgraded models even display temperature readings in both Celsius and Fahrenheit units. It is best to invest in this feature only if you absolutely need to. We always recommend spending on features that have importance for you as a fish keeper. This will allow you to stay faithful to your budget while also ensures high quality and smart purchase.

If you are wondering how to use an aquarium strip thermometer, here is a quick video illustration on reading stick-on or strip thermometers

Best Aquarium Thermometers- FAQs

Where to put stick-on thermometer in an aquarium? The essential step while installing a stick-on thermometer on your aquarium is to clean the target area using a lint-free wipe. The thermometer can be placed both on the front and the backside of the fish tank. Although placing it on the front would make it easier to take the temperature readings. Remove the cover from the strip of the stick-on thermometer. Press it against the glass surface of the tank. Gently rub over the same strip to eliminate any air bubbles. 

What if my thermometer has a different reading that what my heater is set on in an aquarium? Malfunctioning is the most probable cause behind your aquarium thermometer or heater displaying a different temperature reading. Either the heater or the fish tank thermometer is damaged. You can check the accuracy of the thermometer using the ice bath technique. And using a new thermometer confirmed for accuracy, you can check the water temperature in the fish tank. If the new thermometer’s reading matches with the heater reading, it means your original thermometer was damaged and needs to be replaced. If the new aquarium thermometer reading does not correspond with that of the heater, it means your heater is damaged and needs repair while the original thermometer was functioning just fine.

Where should I put my aquarium thermometer? Stick on thermometers that generally come along with your new aquarium kits typically stick to the outer glass wall of your fish tank. Floating glass thermometers are installed on the front or back of the fish tank using suction cups of clips. Digital probe thermometer with LCD display must have their probes dripped into the fish tank’s water while the LCD aquarium display is kept above.

What size battery does an aquarium digital thermometer take? Aquarium digital thermometers come in both forms, wired and wireless. While the wired digital thermometer has a cord connecting them to a power supply socket, the wireless types run on batteries. Typically, digital thermometers for fish tanks use an LR44 alkaline battery. The battery is sized at 1.16 × 1.16 × 0.52 cm and weighs 20 grams. 

What aquarium fish require a thermometer? All aquarium fish, including freshwater and saltwater, have unique temperature ranges in which they thrive well. Hence, an aquarium thermometer is a piece of must-have equipment if you are keeping an aquarium irrespective of its type. When the aquarium temperature is too high or low, and out of the optimal aquarium temperature range, it causes your fish stress and can even prove fatal when prolonged. Even the aquarium plants have a specific temperature range that suits them well. Aquatic fish species and invertebrates are unable to maintain a stable internal temperature on their own. In larger water bodies such as oceans and tanks, due to substantial water quantity, temperature changes occur slowly, allowing the fish to adapt. But in an aquarium with a small amount of water, even the slightest temperature fluctuations can cause a disaster, making an aquarium thermometer a non-negotiable tool for fish keepers.

How to dispose of a broken aquarium thermometer? Floating glass thermometers are incredibly delicate. In situations when the aquarium thermometer breaks, it is best to drain the water completely and rinse the aquarium substrate in a separate container using chlorinated water. It should be noticed that glass floating thermometers do not contain mercury. They contain alcohol, hence also known as alcohol thermometers. A tiny bit of alcohol will cause no harm to your fish if you act fast and conduct a partial water change or clean the fish tank thoroughly. You should instead pay more attention to meticulously cleaning the broken glass floating thermometer pieces.  You can place the remnants of the broken aquarium thermometer in a container to prevent further injury due to the sharp pieces.

Conclusion

An aquarium thermometer is the most essential yet often overlooked piece of equipment for a fish keeper. Maintaining an optimal aquarium water temperature ensures a healthy nitrogen cycle and happier fish tank inhabitants. Choosing the best aquarium thermometer depends on your stage of fish keeping. For beginners, small thermometers such as the floating glass or stick-on thermometers will do the job well. However, for larger aquariums or delicate reef tanks, using a more accurate and durable digital fish tank thermometer is the best choice. A good purchase is when you invest in features that will come in handy instead of spending on extra but impractical bells and whistles.

Also read – How to Choose the Best Automatic Fish Feeder

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