Choose fish for a cold water aquarium

  The aquarium is, for many, an ideal way to get started in the world of pets. A controlled and simple way, with the necessary guidelines, to be able to enjoy a small aquatic ecosystem that can be, for example, a perfect starting point for the little ones of the house to begin to know […]


The aquarium is, for many, an ideal way to get started in the world of pets. A controlled and simple way, with the necessary guidelines, to be able to enjoy a small aquatic ecosystem that can be, for example, a perfect starting point for the little ones of the house to begin to know the responsibility and commitment that supposes to have an animal.

Precisely, if the recipient of this first aquarium is a child, it is important to correctly choose the most appropriate type of aquarium (we recommend you take a look at this other post on how to choose an aquarium). One that not only serves to start it in the aquarium but also has a simple and accessible maintenance for those who begin to become familiar with the world of fish.

Thinking about them, today we want to help you know how to choose cold water fish for an aquarium. A choice that is due to certain reasons that is also important to know. Remember that taking care of them and keeping the fish tank clean is very important to preserver the health of all your fish. Contact us today if you want to know more about this.

Why choose cold water fish

Unlike hot water fish, cold water fish are much more resistant and need less demanding care. This is mainly because they can live with water at room temperature and do not suffer when fluctuations (between 16 and 24 degrees) in temperature occur.

In addition, and also related to this, the cold water fish are those who suffer less with the adaptation to a new aquarium (which may well be the one in our house). To be able to do it correctly, the ideal is to have a pH7 in the water and a temperature of 18 degrees (although the ideal is always to ask when buying them your specific adaptation needs). An initial warmth that may oscillate slightly throughout the days and, despite not having as much heat need, we can also control with a thermometer (but without the need for a heater).

How to choose fish for a cold water aquarium

Finally, despite the rustic nature of this type of fish, it is important to take two aspects into account. On the one hand, when choosing cold water fish, it is important to select species that are not belligerent with each other so that they can coexist in a peaceful way (and we save many dislikes). An important factor for us to have the advice of an expert before making the final choice of our fish.

In this same line, it will also be important to consider which plants are ideal for our fish selection. Unlike tropical fish, some cold water fish tend to eat plants that are part of the aquarium and this gesture can be harmful to them. Good reason, again, to consult with an aquarium specialist in our centre, Guppy’s Aquarium Products which plants are the best for our fish.

Cold water fish perfect for an aquarium

Unlike the popular belief, cold water fish do not detract anything from hot water in terms of beauty and beauty. It is possible to enjoy the same intensity of colours and exoticism even if it is not tropical fish.

We will discover some of the most common and, not for that, less beautiful.


It is a descendant of the carp and, despite the apparent prejudice, there are many types of Goldfish although it is usually generalised by its orange character and similarities of appearance. Unlike what is believed and what happens in many homes, the Goldfish needs a good size aquarium since they require a lot of oxygen (a good reason to run away from the typical round fish tanks). They are not complicated fish when it comes to feeding and, with proper care, can live between 6 and 8 years. What is important is that they have at least one partner in the aquarium, since they are social fish.

Chinese neon

An ideal companion for Goldfish fish. Like the latter, the Chinese Neons are social fish so it is advisable that, if you decide to have them in our aquarium, consider having at least one group of seven. Striking and cheerful, the Chinese Neons are also simple to take care of and undemanding in their needs (they support temperatures between 15 and 20 degrees). The only precaution that we will have to have with them is that they are constantly jumping, so it is most advisable that our aquarium has a lid to avoid dislikes.

Betta Spledens

Despite its tropical character, Betta Spledens fish adapt perfectly to cold water. Unlike the fish we have seen before, the Betta (also called as “Siam Wrestlers”) are aggressive, so they coexist badly with other fish species. If we want to have them in our aquarium, it is important to know that the ideal is to have a male and a maximum of three females. Yes, we will have to be careful since they reproduce easily.

Fish Telescope

It is, perhaps, one of the most unique cold water fish. For your body (with eyes protruding from the body), it is important to control that the decoration of our aquarium does not have sharp edges that can damage your eyes. It is easy to take care of and is not demanding with your diet, but we will have to take into account that you need to eat several times at the end of the day and that, every so often, we will have to change your diet (they are prone to bladder problems). With the necessary care, they can live up to 10 years.

Remember that Guppy’s Aquarium Products is the top online shop where you can buy anything you need for your aquarium from the comfort of your house and have the most remarkable and eye-catching fish tanks to astonish all your guests and have them asking you how to have such a wonderful fish tank at home.