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How many degrees should be in the aquarium

maintenance, care, compatibility

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.

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?

In natural waters, fish are more accustomed to temperature changes, since this is their natural habitat. Yes, and the area of ​​water space is such that warming or cooling water occurs gradually.

So the fish here have time to adapt.

With aquariums, the situation is somewhat different: the smaller the volume, the more tangible the temperature jumps. And the more likely the development of “fish” diseases.

Novice aquarists should consider this feature and know what the normal water temperature in the aquarium is.

In one aquarium, it is desirable to keep the fish, accustomed to certain conditions of life, with the same features of the body. Despite the fact that all the fish – cold-storage, some of them live in cold waters, others – in the warm.

  • Fishes accustomed to warm waters can be divided into 2 species: consuming a small amount of O2 and those who need large reserves of oxygen.
  • A cold-water type of fish is only called that – they calmly withstand different temperatures, but they require a large amount of oxygen in the water.

For beginners aquarists can recommend small aquariums with low-breathing warm-water fish. In large tanks, it is better to initially contain the cold-water inhabitants of aquariums.

What should be the temperature of the water in the home aquarium

To the inhabitants of domestic ponds was comfortable, the temperature there must be at a certain level. And before you run the fish in your aquarium, you need to know what the natural conditions of its existence are (and most of the aquarium inhabitants come from the tropics).

The gradation of temperature parameters can be represented as follows:

  • The optimum temperature of the aquarium, which is suitable for most fish, ranges from 220 to 260C;
  • water temperature in the aquarium below the minimum optimum is no longer acceptable to warm-water fish;
  • a rise in temperature above 260 is permitted by 2-40 ° C if it is gradual.

Changes in temperature in a domestic pond to one side or the other from the optimal parameters are more easily tolerated by aquarium inhabitants if the water is sufficiently enriched with oxygen. The most difficult thing will be to fed fish – they need more air at any temperature drop.

But with a sharp cooling, the fish will suffer and hungry.

Experienced aquarists have long protected themselves from such troubles as the need to lower or raise degrees. To keep fish at optimum temperature limits, the following rules should be taken as a basis.

  • Choose the “right” place for the aquarium: away from heating appliances, air conditioners, away from direct sunlight (especially in summer) and drafts.
  • Thermowheel should be of high quality and reliable sensor.
  • A thermometer is an indispensable device for completing any aquarium. The location of its location, select such that it was convenient to monitor the indicators of the scale.
  • Aeration is not a whim, so the compressor should turn on regularly. What habitat without enough air will be comfortable?

How to lower the temperature of the water in the aquarium:

The life of all living organisms, including humans, is determined by a number of environmental factors. Among physical factors, temperature plays the greatest role, affecting the flow of all metabolic processes within an object.

That is why the observance of the correct temperature regime will provide your pet with comfort and long life.

The optimum temperature in an aquarium can vary within very wide limits for different organisms of even one family, therefore we cannot separate each one individually. But to discuss the temperature optimum for the most common inhabitants of aquariums, we are quite capable.

Temperature in a guppy aquarium

Guppies are not demanding fish and can easily live in a regular can, but for nurturing beautiful and healthy pets it is necessary to provide them with space and regular aeration of water. Regarding temperature, guppies are also labile, the range from 18 to 30 degrees is suitable for vital activity, but the optimum is 24-25 degrees.

The temperature of the water in the aquarium for the angelfish

Angelfish are warm-water fish, so the fact that for guppies is considered an extreme temperature for existence, for scalar still quite a pleasant atmosphere. Anyway, these cold-blooded fish are most active at 28 degrees, while at 24-25 their growth and development begins to slow.

Temperature in a cichlid aquarium

Cichlids are very sensitive to temperature fluctuations. As a result of hypothermia or overheating, they not only stop the development, but also lose the opportunity to develop their remarkable color, which is why the temperature in the aquarium for such fish should be a constantly adjustable parameter.

The optimum is 25-27 degrees, but for Tanganyik cichlids, this temperature should not exceed 26.

The temperature in the aquarium for barbs

Barbus – fish is simple to keep. Barbs are easy to feed, breed and maintain conditions optimal for their existence.

The optimum can be considered the temperature in the range from 21 to 26 degrees, while it is desirable that the water is well aerated and there was a slight flow.

Temperature in a catfish aquarium

More than 1000 species of fish from different families are called somami, therefore it is not easy to determine a single temperature range. Usually, catfish love temperatures closer to room temperature. in the range of 22-25 degrees.

For stimulation of reproduction, the temperature is usually increased by 2-3 degrees.

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.

Yes, their body temperature is directly dependent on the ambient temperature. Only a few fish, for example, some catfish, can change body temperature, and even sharks maintain body temperature a few degrees higher than water temperature.

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

How sensitive are fish to temperature extremes?

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.

You can read more about acclimatization by clicking on the link. But, in short, the fish actually needs a lot of time to get used to the new conditions.

Only water temperature is critical when landing in a new aquarium, and it is desirable to equalize it as much as possible.

To make the water in the aquarium crystal clear, as in a public or store pond for fish, you must achieve a certain level of transparency in various ways. Very clean, almost blue water is a liquid without turbidity, dirt and harmful impurities. In such an environment, any decorative pet will feel safe, demonstrating health and beautiful appearance.

New aquarium, or old – it does not matter, it is better to wash it thoroughly and clean the water. There are conditions, the maintenance of which will make the aquarium water crystal clear.

The purity of the decorations in the aquarium also affects the quality of the water. The rules that are best to follow when installing jewelry in a container:

  1. All decorations (grottoes, caverns, coconuts, snags, castles, labyrinths) should be treated from dirt and parasites in infused water (leave them for 3-4 days).
  2. If you decorate the bottom with stones, let them be red or black. However, the stones must be washed carefully, it is desirable to boil them. Calcium and magnesium in the stone which increase the hardness of the water spoil the parameters of the reservoir
  3. Put the stones in the poured water so that they “got accustomed.”
  4. Cover the aquarium – as long as the fish do not live in it, it will be saved from dust and insects, and a film of cyanobacteria will not form on it.
  5. After installing the decorations, run the fish in 2-3 days until the water in the aquarium settles, establishing biological balance.

Read more: Coconut in an aquarium – what you can do with your own hands.

See how to prepare a snag for an aquarium.

Known so-called “live” and “inanimate” filters that help clean the water from pollution and bring it into a beautiful view. For aquariums install mechanical filters with a cassette and a sponge. However, once in the store where the fish are sold, you noticed that they swim in an ordinary tank, where there is no filter.

It turns out that it is possible to maintain perfect purity without mechanical devices, sometimes their constant use brings harm. If there is no such filter in the aquarium, it means that it has a biological filter.

Biological, that is, living filter – these are plants that are planted in a lighted place. Infusoria and microwells that feed on bacteria are well developed in them.

Thickets also keep dirt and turbidity in the aquarium with their stems and leaves.

Excellent “filters” are bottom fish (catfish) and snails that eat carrion. Based on the observations, the cochlea is able to make the water absolutely clean in a matter of days. This is probably the most affordable “filter” for a tank of water.

Just be careful – some species of fish and amphibians are not averse to eat it.

One more representatives of the underwater world who are able to clean the environment in an aquarium are clam clams. Pea and sharovka love warm water, and toothless and perlovitsa – cold. Unfortunately, like snails, these mollusks can be eaten, so before putting them into the tank for “cleaning”, it is better to evict the rest of the pets from it.

Also, the larvae of toothless and perlovitsy parasitize on fish. Most likely, after cleaning the reservoir, you will have to quarantine the aquarium.

Spur frog – vertebrate amphibian, which will bring the aquarium to transparency. She can constantly live in the nursery with small fish, in parallel helping the water to be updated. The frog always lives in the water, but if it brings fry – and there are a lot of them, the aquarium jungle will not rest.

Carefully monitor the parameters of the water in the aquarium: regularly update the water, plant the correct plants, settle the “orderlies” into it, then it will get a wonderful appearance and a healthy balance.

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