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The temperature in the aquarium for fish

maintenance, care, compatibility

The temperature of the water in the aquarium is the most important factor when breeding fish

To make your pets comfortable in the water, you need to know exactly what the temperature should be in the aquarium. First of all, it should be remembered that each type of fish has its own water temperature. Someone likes cool water, and someone is more thermophilic.

This should certainly be considered when you begin to equip the aquarium. Especially if you want to put there different fish.

First make sure that all of them are able to exist at the same temperature.

So, you decided to buy a few fish. In this case, it will not hurt you to know what kind of temperature in the aquarium prefers.

It’s pretty simple. Most of the existing ornamental fish today are quite suitable temperature from 22 to 26 degrees.

There are some types of fish (there are few of them) for which the optimum temperature will be slightly higher – from 28 to 31 degrees. These include, above all, discus and labyrinth fish.

But goldfish, on the contrary, prefer a cooler water temperature in the aquarium – only from 18 to 23 degrees. Although they, of course, can live quite a long time (more than a year) in water, say, about twenty-five degrees.

But after that, goldfish invariably develop various diseases and ailments. Therefore, it is better to maintain an optimal cool temperature.

The remaining types of fish, perhaps, are not so demanding and can quite comfortably exist at a standard water temperature in the aquarium of 22-26 degrees.

Quite often, aquarists have to change the temperature of the water in an aquarium in order to ensure a safe life for their fish. For this there are special devices.

Many aquariums were originally equipped with special heaters, thermometers and thermostats, which allow both to lower the temperature in the aquarium and vice versa, to heat the water.
If your aquarium is equipped with a full arsenal of such devices, it will be easy to maintain the desired temperature. How to lower or raise the temperature in the aquarium?

Simply follow the thermometer and, if necessary, adjust the temperature.

The main thing – do not allow sudden drops. Sudden fluctuations in temperature (more than 2-3 degrees) can adversely affect the health of your fish.

Stress, cold and other troubles will bring nothing but harm. Therefore, when buying an aquarium, choose a model with a thermometer so that you can constantly maintain the desired temperature.

The development, livelihoods and health of the inhabitants of the water element is directly dependent on the state of the water. And ornamental fish is no exception.

The fact is that the chemical and biological processes of their body are closely related to the temperature regime.

For example, heating water just 8-10 degrees above normal causes the fish to increase oxygen consumption. And in an excessively warm aqueous medium, the solubility of oxygen molecules decreases.

This factor in some cases can even lead to the death of the inhabitants of the aquarium. In such situations, they say that the fish suffocated.

Undesirable and sudden changes in temperature, which are possible if the house for aquatic animals is installed incorrectly: at the window on the sunny side, for example.

Often it is required to provide cooling water in the aquarium. Such a need may arise at high air temperatures in the room.

For these purposes, special devices have been created – aquarium coolers. They are of two main types: air and water.

Air cooler at its core is a compact fan with a thermal sensor. It is attached to the top of the rear window and chases the cool air above the surface of the aqua, increasing the rate of evaporation of warm water.

After cooling the water, the fan stops at the command of the thermal sensor. Low energy consumption, low noise level during operation contribute to the widespread use of such coolers in small and shallow aquariums.

As an example: high reliability and low power consumption distinguish portable cooling fans series JBL Cooler German production. They are all equipped with a thermostat to adjust the running time.

For large home or office aquaria use, as a rule, external coolers. They are also called aquarium refrigerators.

By design, they really are compact refrigeration units, very effectively cooling the aquarium water that is driven through its system.

Devices mounted near the tank, equipped with two tubes, which are lowered into the tank. One tube serves to collect warm water, and the second – to release the cooled.

On the aquarium market, such devices are represented by the products of the Italian company Teco, the Chinese series of aqua-coolers HAILEA and Resun.

Forced adjustment of the aquarium water temperature is a must. The choice of suitable heaters and coolers depends on the size of the aquarium, the air temperature in the room and, of course, on the aquarist’s budget.

Video on how to organize the cooling of the aquarium with your own hands:

Water temperature in a fish tank – Frequently asked questions by aquarists

Have you ever thought about why different fish need different temperatures? And how does the discrepancy affect them?

And how sensitive are they to drops? Rapid changes in temperature aquarium fish suffer poorly, this is one of the reasons from which newly acquired fish die.

In order for fish to get used, they need to be acclimatized.

Simply put, the higher the temperature of the water, the faster the fish grow, but they also age faster. We collected a few frequent questions about the temperature for aquarium fish and tried to answer them in an accessible form.

Does this mean that the temperature of the water directly affects the fish?

Water temperature affects the speed of physiological processes in the body of fish. For example, in winter, the fish of our water bodies is inactive, since the level of metabolism drops significantly in cold water.

At high temperatures, water retains less dissolved oxygen, and for fish it is very important. That is why in the summer we often see fish rise to the surface and breathe heavily.

Rapid changes in temperature aquarium fish suffer poorly, this is one of the reasons from which newly acquired fish die. In order for fish to get used, they need to be acclimatized.
Simply put, the higher the temperature of the water, the faster the fish grow, but they also age faster.

How sensitive are fish to temperature extremes?

Fish feel the slightest change in water temperature, some even such as 0.03C. Aquarium fish are usually all tropical species, and, therefore, are accustomed to live in warm water with a constant temperature.

With a dramatic change, if they do not die, they will survive significant stress and become infected with an infectious disease, due to a weakened immunity.

Fish that live in a climate like ours are much more stable. All carp, for example, tolerate different temperatures well.

What can I say, even the well-known goldfish, can live both at a temperature of 5C and at more than 30C, although such temperatures are critical for them.

As already mentioned, warm water retains less oxygen, and the fish begin to experience oxygen starvation. They begin to choke, and the first thing to do is turn on a powerful aeration or filtration to increase the movement of water and metabolic processes in it.

Next, you need to put in the aquarium a bottle of cold water (or ice, if you were preparing for this situation), or replace some of the water with fresh water with a lower temperature.

Well, the simplest and most expensive solution – air conditioning in the room. And in more detail about all this read in the material – hot summer, lower the temperature.
And the simplest and most inexpensive is to install 1-2 coolers so that they direct the air flow to the surface of the water. This is a proven cheap way to cool the temperature in an aquarium by 2-5 degrees.

And what tropical fish can you keep in cold water?

Do I need to change the water in the aquarium with water of the same temperature?

Yes, it is desirable that she was as close as possible. But at the same time, in many species of tropical fish, the addition of fresh water with a lower temperature is associated with the rainy season and the beginning of spawning.

If you breed fish in your tasks is not included, it is better not to risk and equalize the parameters.

For sea fish, it is definitely necessary to equalize the temperature of the water, since sea water does not have sharp changes.

Scalaria (lat. Pterophyllun scalare) is one of the most popular aquarium fish of the Cichlid family. Many species of this fish were removed from South American reservoirs, while others were bred by breeding one or more forms.

The common angelfish is perhaps an example of a classic aquarium fish – a disc-shaped body shape, tall and slightly short, with lush sail-like fins. At first glance, it is not so easy to keep such a pet in an aquarium, but this opinion is wrong. They have a peaceful nature, non-aggressive.

They can settle different types of fish of the same calm and medium in size: discus, festivals, crayfish, gourami.


It so happens that novice aquarists acquire a scalar without learning the main rules for caring for them. Run into a new aquarium, where the biological balance of the environment has not stabilized.

Improper temperature, high acidity, hard water will quickly ruin the health of the angelfish. The presence of nitrates, nitrites, ammonia, and non-evaporated chlorine in water also negatively affects the quality of life of pets. With the fluctuations of such substances the scalars can not cope.

This also applies to the parameters of the water in the spawning aquarium, where you have to follow the rules of keeping producers and their brood.

Watch the video story about the content of the scalar.

Therefore, it is important for scalar to maintain a temperature regime. As endemics of tropical freshwater, they are accustomed to warm water. Lowering the temperature of the aquatic environment leads to lethargy, disease, and, as a consequence, death.

Hypothermia or too high a temperature is also harmful, as well as a sudden change of water to a new one. To maintain a full life of a pet, it is necessary to regulate the temperature of the water in the aquarium constantly.

Angelfish begin to multiply with a gradual increase in water temperature in spawning. Temperature from 27 to 28 degrees – optimal for breeding almost all types of scalar.

With her, the eggs will ripen faster, and the fry in such water will develop comfortably. Within a few weeks, the male and female will get used to the new parameters that will encourage spawning. After 2 weeks they will produce eggs on the surface of a stone or a plant.

A few more days, the roe will ripen, then the fry will hatch. Unfortunately, at low temperature, the roe slowly ripens, or the larvae of the fry never appear.

To avoid this, make measurements to water with a special thermometer. Having raised the temperature a little, some fry of an angelfish will be born.

Proper fish care can only be ensured if the aquarium is properly installed. Proper setup of the tank does not take much time. Guppies can transfer a wide range of parameters of the aquatic environment: pH 5.8–8.5, although ideally the pH should be 7.0–7.2.

The recommended water hardness is 15 dH. Fish are not recommended to settle in banks or round mini-aquariums. It will be uncomfortable for the fish to live there, and caring for them will be difficult – it is difficult to clean the walls of a round can with a scraper.

To install the heater, filter, compressor, lighting, decor and plants, you need a spacious rectangular tank. The breeding of fish should also occur in a rectangular aquarium or spawning.

To prevent the temperature of the water from fluctuating within wide limits, install a heater in the aquarium that will regulate it. Guppies prefer water at a temperature of 23-26 ° C.

If you need to quickly grow fry fish or stimulate reproduction, you can raise the temperature to 27-28 degrees.

Quality care is not possible without lighting, which can indicate many problems in the aquarium. Bright lighting will be a source of vitamin D, and the lack of light can cause spinal curvature.

Abundant, constant coverage will also harm pets. For fry, the optimal amount of daylight hours is 4 hours a day, and 8 hours of darkness.

At night, the light must be turned off (after 8-10 hours of light for adult fish). You can purchase a timer for luminaires, which are automatically turned on and off every day.


Filtration system – to keep the aquarium water clean. When the filter filler begins to darken, it is a signal that it is time to replace it. It is impossible to replace all the filtration systems at once, otherwise the beneficial bacteria will disappear.

They decompose ammonia in water, which is formed from fish waste. It is better to cut the sponge, and replace the second half with a new one. If you use activated carbon as a filler, change it more often and according to the instructions.

Also replace once a week with 25% water for fresh.

Air pump – supplies oxygen to the aquarium water. It will pump out air bubbles and create a current, saturating water with oxygen.

Plant in aquarium live plants that also emit oxygen. These can be stile-leaved species: anubias, cryptocoryne, elodea, arrowhead, aponogeton and others.

The scenery – not only decorate the aquarium, but can also serve as a shelter for fish. At the bottom of the aquarium, lay out sand or gravel, in which it is easier to place live plants and structures.

Do not forget to install shelters in the form of caves, grottoes, pipes, clay pots.

See how the guppy fry are born.

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