Temperature in the aquarium


The optimal temperature for fish in an aquarium and how to maintain it

Fish are cold-blooded animals, the full activity of which is ensured by the constancy of the water temperature in the habitat. The body temperature of the fish exceeds the water temperature by about 1o. Changing the temperature of the habitat directly affects the health of cold-blooded organisms.

All holders of aquarium fish should understand that the life of their pets directly depends on the temperature conditions in the aquarium. What should be the optimal water temperature for different ornamental fish, and how many degrees should be reflected on the scale of the thermometer so that each fish feels healthy?

About temperature limits for warm and cold-water inhabitants of reservoirs

Tropical and subtropical regions are not characterized by frequent changes in water and air parameters. In Southeast Asia, the temperature range of air is the same throughout the year, sometimes ranges from 3 ° C (26-29 degrees), and the difference in water is almost imperceptible. In South America, hot and humid, throughout the year to air 25-28 degrees.

There are species of fish that prefer wide temperature ranges, and there are those who live only in a narrow range. Only the fry of most fish are resistant to the drop to. When the amount of dissolved oxygen in the water decreases, all fish are less sensitive to temperature changes. Hydrobionts get used to high temperatures in a few days, and to cold temperatures - in almost a month. For normal acclimatization, a gradual increase in to 1-2 degrees, and a decrease in 0.5-1 degrees is necessary.

Watch the video about the aquarium heater.

All fish species have their own upper and lower threshold to. Fish are sensitive to those parameters that go beyond the permissible limits. When the border is violated by several degrees, the health of the fish deteriorates dramatically. Frequent and sudden changes in temperature adversely affect the health of pets. In order to maintain an optimal temperature regime in an aquarium, you need to familiarize yourself with the allowable temperature conditions for warm-water and cold-water fish.

For warm-water fish to water below 18-20 degrees is considered unacceptable. In aquarium fish in this category it is possible to survive in the lower ranges for a long time. But this fish needs a lot of oxygen and space, good aeration is necessary.

For cold-water fish suitable aquarium without heating, 14-25 degrees for them - the maximum. They also need an abundance of dissolved oxygen.

Average temperature range

The fluctuation of aquarium temperatures is possible, it is even permissible within certain limits. A slow change of 2-4 degrees will not lead to tragic consequences. If the aquarium is placed on the window sill or near the window, then depending on the time of year, the temperature will change in it. Aquariums should not be installed near batteries and other heating systems, even heat-loving fish will not survive strong heating.

What can be the water temperature for different fish? You can set the average range of oscillation for cold-water and warm-water fish, but these are not settled in one aquarium - this is prohibited. How many degrees should be acceptable temperature limit, which would be acceptable to all:

  • 24-26 degrees Celsius

See how in the heat to lower the temperature in the aquarium.

Temperature fluctuations should not exceed three degrees! Before settling in the fish aquarium, find out what the average temperature range of their content.

It is also worth controlling to above water - this is important for labyrinth fish that breathe portions of air from the surface. As an example, you can explore the content of the labyrinth fish gourami, which, breathing the air 5o below the water, can suffocate and die. Just for them, the cold air is critical.

It is recommended to install a thermometer and thermostat for water and air to keep the gourams. Water should evaporate in a minimum amount, and to water above water should be similar to that in a pond. If gourami inhale too hot or cold air, the untreated oxygen enters the labyrinth channel, clogs it, and the fish suffocates.

Gourami are temperature sensitive because it affects the breeding cycle. Warm water is an incentive to spawn, in this period it is appropriate. If it is warm all the time, in the body of gourami the processes of vital activity slow down, the protective functions of the body are reduced. At an incorrect temperature, sex cells are not produced, and gourami will not give offspring. Surviving fry in the wrong aquarium water conditions die.

Allowable temperature for gourami in water: 23-26o, to air on the surface - 26-28o.

Is it true that cichlids tolerate different temperature ranges?

For cichlids, the content in warm water is necessary, since such a temperature of water produces the release of enzymes for saturated body color and stimulates them to spawn. Cichlids have high tolerability of both high and low temperatures, but not more than 6 hours. The tank can maintain an average temperature range. At elevated temperatures of cichlids, their color is quickly saturated, but they are depleted and live less.

At lower temperatures, the color of the cichlid tarnishes, the fry grow and develop slowly. The allowable temperature for cichlids is 24-30 degrees. The limit is 24-27 degrees. For Tanganyik cichlids, the water should not be warmer than 29 degrees. In the treatment of certain diseases of cichlids, to increase for some time.

Cichlids are indeed one of the most enduring fish in an aquarium; for a novice aquarist, many members of this family will be excellent pets. However, all types of fish require attentive care, which should not be forgotten.

Water temperature for aquarium fish

Aquarium water temperature

Water temperature for aquarium fish

One of the most important parameters of aquarium water is its temperature. Most aquarium fish feel comfortable at a temperature of 22-26 ° C. But there are fish that prefer a lower or higher temperature.

For example, discus is a heat-loving fish, a comfortable temperature for their maintenance is 28-31 ° C. But the Goldfish family, on the contrary, prefers cooler water at 18-23 ° C.

Thus, speaking of the temperature regime in an aquarium, one should take into account the comfortable temperature parameters for a specific fish. It should also be noted that the temperature of aquarium water directly affects the lifespan of some species of fish. For example, neons at a temperature of 18 ° C live 4 years, at 22 ° C - 3 years, 27 ° C - 1.5 years.

Perhaps the most important rule for an aquarist is to prevent sudden changes in temperature (2-4 degrees). Such vibrations are extremely harmful.
for fish.

Today, there are virtually no problems with maintaining the temperature regime in an aquarium. Therefore, when on the Internet you come across articles about the Soviet methods of “boiling with a kettle” involuntarily you are touched. Only one thing is frustrating - after all, articles on this topic are usually looked for and viewed by novices or young aquarists who are so easily confused with unnecessary, unnecessary information.

The nuances covered in this article for an experienced aquarist will not inspire innovation, but beginners will be noticed.

So, to maintain the required temperature regime of aquarium water, you need to buy two things at the pet shop:

1. Thermostat heater.

2. Thermometer with suction cups.

Regarding the temperature control of the heater for the aquarium - it is chosen based on the volume of the aquarium (its power must be appropriate). They fix it, as a rule, on the back wall of the aquarium, near the filter with aeration, so that it is completely immersed in the input. IMPORTANT: when setting the desired temperature on the scale of the thermostat, the first time (6-12 hours) watch the level of heating of the aquarium water. This is due to the fact that often the scale of the thermostat does not always correspond to the actual temperature of water heating (especially in Chinese thermostats) or the thermostat does not quite fit the volume of the aquarium. Failure to comply with this rule may lead to the fact that in the morning your aquarium may turn "into a saucepan with a good - elite ear."

Well, the second thing to which you should pay attention - the heater for the aquarium should be completely immersed in water. Do not allow it to be in the on state in air (in whole or in part). This will lead to its rapid overheating.

Regarding thermometers for aquarium - everything is simple here! They are:

glass (ordinary) ~ $ 1.2;

in the form of a self-adhesive strip thermometers for the aquarium~ 2$

(I do not recommend. creatively — yes, it is practical — no, especially since this strip “fades” over time);

and electronic thermometers for aquarium 12$;

When buying a thermometer should pay attention to the quality of suckers. If they are weak - the thermometer will often fall to the ground. In addition, there are fish that pathologically may not like the thermometer and they will deliberately drop it (I have suffered from these gays blue).

I think that with the heating of aquarium water everything is clear: - set, adjusted and forgot.

Let's now talk about what to do if the temperature goes over the top (from overheating or "summer in August"). Nowadays, this is also not a problem - the air conditioner will not only cool the room, but also lower the temperature of the water in the aquarium.

Another question is what to do if it is not? Or if you need to urgently lower the temperature? Ice from the refrigerator will come to the rescue. At one time, I poured water into plastic 2-liter bottles (carefully removing the bottle from the label and glue beforehand) and frozen them in the refrigerator. After lowering them into the aquarium and thereby lowered the temperature of the water to the desired.

This method of lowering the temperature has two minuses: firstly, the frozen bottles and ice heat up quite quickly - they often need to be frozen, and secondly: sudden, frequent temperature drops are poorly tolerated by aquarium fish. If the temperature is "tolerable" it is better not to add ice bottles.


Video about the temperature and care of the aquarium

Aquarium water temperature

All life on our planet can exist only in the optimal temperature range. This fully applies to ornamental fish. What temperature should be maintained in the water house? How to create comfortable conditions for different types of fish? On these and other issues you need to think before starting the breeding of aquarium living creatures.

Temperature and health of fish

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.

Optimum temperature

Most often, people keep fish in their home aquariums, whose homeland is tropical latitudes. The water temperature in this climate is practically unchanged and is 20-26 degrees above zero. Approximately the same amount should be maintained in the aquarium for the owners of decorative domestic fish. True, for different species there may be some variations of the regime.

Goldfish, for example, like cool water, not lower than +18 and not higher than +23 degrees. Even a slight increase in temperature can lead to the development of diseases in these cold-blooded beauties.

Holders of such rare species as labyrinth fishes or beautiful discus, know that they need to maintain a higher temperature of water - about 30 degrees Celsius. This is one of the reasons why these fish are not recommended for breeding novice aquarists.

All other types of decorative floating creatures are quite satisfied with water with a constant temperature of +22 to +25 degrees. By the way, the same mode is considered optimal for aquatic flora, as well as for crayfish and shrimp.

So, a normal climate for life must be constantly maintained. This is achieved using special aquarium equipment.

Water heater for aquarium

If the aquarium is deep enough, then the water in its lower part is somewhat colder than the surface. It is believed that the temperature difference should not be more than 2 degrees, and ideally the aqueous medium should be homogeneous.

That is why, when heating water, the so-called rod heater is most often used. This simple device constructively is a hollow glass (or ceramic) core, inside which is placed a heating element - nichrome wire.

With the help of suction cups, the aquarium heater is mounted vertically to the tank wall. Most models have an automatic heating control function.

Such devices on the market are very widely represented. Here you can select the heater aquarium company Polish Aquael or Chinese product brand XILong. Products of these manufacturers are available with or without thermostat (budget option).

Aquarium Cooler

Often it is required to provide water cooling 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:

What temperature should be in the aquarium and how to maintain it?

Many fish breeders initially face many challenges. The main task is the choice of volume, since most people live in apartments and have a small living space. Having determined the size of the aquarium and installing it, they begin to gradually equip the house for the fish. And here it is especially important to pay attention to the equipment.

In pet stores there is a large range of aquarium equipment and accessories. Many, having bought everything they need, often forget about heaters. If in the summer there are practically no problems with maintaining the temperature of the water in the aquarium, then in the cold season, overcooling may cause the death of the fish. In order to figure out what kind of heater you need, first determine what temperature should be in the aquarium.

Temperature conditions

On average, the water temperature should be 18-25 ° C. These numbers are the norm in winter. In the summer, it can rise to 30 °, which is the maximum for the normal functioning of fish. If you exceed the threshold of 30 ° C water needs to be cooled. To this end, aquarists acquire special "refrigerators", which are a few small fans installed under the aquarium cover.

All experienced fish breeders know that the optimum water temperature in an aquarium is from 18 ° C to 25 (27) ° C. In each case, it can change up or down, depending on the species composition of your aquarium. Therefore, in order to find out what the temperature should be in the aquarium, pay attention to its inhabitants.

What to use for constant temperature control?

In order for the water to have a constant temperature, special heaters are used, popularly referred to as "heaters." Depending on their design, these devices may have an automatic controller, which is activated if the water temperature drops below the set value. More simple models do not have this option, so their work must be under the control of the owner, who knows what temperature should be in the aquarium.

What are aquarium "heaters"

Most models of devices such as heaters for an aquarium, consist of a glass case with a spiral soldered into it, which radiates heat when heated. Not once there have been cases when, when cleaning an aquarium, the heating pad slipped from the hands and broke. Manufacturers, in order to avoid such situations, have invented new models that are more compact and do not beat on impact. They are made of special plastic alloys that are heat resistant.

Thanks to such devices, once having set the value on the regulator, you will never have to monitor what temperature should be in the aquarium, as it will be constantly under the control of the heater.

From the above it follows that the temperature of the water in the aquarium is one of its main parameters. It affects the metabolic processes occurring in the body of the fish. Now you know with what and how to maintain the temperature in the aquarium.

What temperature should be in the aquarium?

Water temperature is one of the defining indicators for the life and health of the inhabitants of the aquarium. What temperature should be in the aquarium depends, first of all, on the species that you plan to maintain and breed.

The optimal water temperature in the aquarium

Each species of fish or amphibians has its own optimal conditions of detention. You should familiarize yourself with them before purchasing the first copies and placing them in a new aquarium. Such a preliminary acquaintance with one type or another will allow you to choose fish that match the requirements of the conditions, which then get along well and seamlessly with each other.

Most of the most common and popular fish species will feel good in aquariums with a water temperature of 22-26 ° C. Therefore, setting the temperature of the water in the aquarium for guppies, the scalar and swordtails need to stay within these limits. Some breeds of fish, but not too much, love the water warmer. Usually for labyrinth fish and dikus it is recommended to heat water up to 28-3 ° С. Goldfish is another matter. The water temperature in the aquarium for goldfish is set in the range of 18-23 ° C. In warmer water, their life expectancy is significantly reduced, they can get sick.

We should also mention the temperature of the water in the aquarium for the red-eared turtle, since the content of these amphibians is becoming increasingly popular. Turtles love warmth and feel best in water heated to 25-28 ° C.

Regulation of temperature in the aquarium

Continuous monitoring of the fluctuations in the temperature of the water in the aquarium will allow you to notice strong changes in time and respond accordingly: heat the water to the required level or, conversely, cool it. Therefore, the acquisition of a thermometer for an aquarium is simply a must-have item for its arrangement. After all, water, especially in small aquariums, may cool down and heat up very quickly, and this will not be noticeable to the eye until the fish start to behave sluggishly or do not die at all. Now you can also purchase special heaters for the aquarium, which not only heat the water, but can also maintain the same temperature during operation. If the aquarium is not equipped with a similar heater, then it can be purchased separately. When it is necessary to lower the temperature of the water, it is necessary to pour a small amount of it, and in its place to pour water at a lower temperature. However, do not immediately replace too large amounts of water, as sudden changes in temperature will adversely affect the health of the fish. Better after a while to repeat the operation again.

What is the optimum temperature to be in the aquarium?


Most aquarium fish will suit 22-26 ° C. Perhaps only discus and some labyrinth fish prefer water warmer: 28-31 ° C. Goldfish need water more cool. When the aquarium content of the temperature range of 18-23 ° C, they are quite satisfied. For quite a long time (a year or more) they can live at 25-27 ° C, but eventually they get sick - as a rule, they develop dysfunction of the swim bladder.
It is important to avoid significant (more than 2-4 degrees) temperature fluctuations. Its smooth changes are quite permissible, but sharp jumps during a day, or even several hours, are extremely undesirable. Meanwhile, this happens not so rarely, especially with small aquariums with a capacity of less than 60-50 liters. Relatively small volumes of water cool quickly and heat up quickly. For a long time, the open window in the cold season can easily draw a room. If there is no heater in the aquarium, then in a few hours of such aeration, the water in it will noticeably cool down. It turns out the fish, too, can catch a cold. And then "pick up" a bacterial infection or chylodonellosis. If there is no thermometer in the aquarium, such temperature fluctuations may go unnoticed by the owner of the aquarium. It should be noted that a small aquarium is immeasurably smaller than even a small natural reservoir, where water temperature changes proceed much more slowly (large masses of water slower and cool down and heat up more slowly). That is why fish are completely unsuited for sudden temperature jumps and these jumps can cause them great stress.


The temperature of the water in the non-heated aquarium is equal to or lower than in the room. For warm-water fish, this is not enough. Most aquarium fish and plants live at a temperature of 24 - 26 'and therefore need heating.

wild cat

The optimum temperature for your fish is 24-26 degrees. The thermometer will have to be bought as the temperature set on the heater may not correspond, for example, I now have a heater at 19 degrees, and in fact the water temperature is 26 degrees. so that…