If you want to please a small child, decorate the interior of a room or freshen dry air, then installing an aquarium will come in handy. Underwater inhabitants are absolutely silent, therefore they will not disturb the natural rhythm of life of all family members. And caring for them is not comparable to keeping, for example, dogs or cats. However, with the seeming unpretentiousness of aquarium fish, in order to avoid their premature death, before buying, you should familiarize yourself with the characteristics of existing species, compatibility with a long stay in one tank, and service conditions.

Since such fauna performs a decorative function, then when choosing it, one should take into account the harmony or contrast of the color combination with plants and other accessories of the aquarium. Transparent fish or light-colored fish look good against a dark background, pastel shades of the ground suggest the placement of individuals in bright or dark colors. The unusual shape of the body, the presence of original fins, the ability to quickly adapt to a certain composition of water also affect the popularity of the species among beginners and experienced aquarists. Our rating contains the most common representatives of the underwater aquarium world.

The best heat-loving fish for an aquarium

5 Cichlid pseudotropheus demasoni

This representative of the underwater world of African origin is usually of interest to experienced aquarists, since she is very picky about the neighborhood with non-cichlid individuals. In addition, the fish requires a high level of water purity, a large amount of it, and active filtration. For a stay of one individual up to 10 cm in size, a 150-liter container would be the best option. But if the Demasoni create ideal conditions, then the reward will be easy breeding. Aquarium inhabitants perfectly tolerate both fresh and slightly salty water; during the spawning period, it should have an average temperature of 27 degrees. By nature, individuals are very active, curious, able to swim along an uncharacteristic trajectory, even upside down.

4 Corydoras speckled

The albino form of the representative of the fauna is excellent for aquariums with dark coarse sand or fine gravel. Against their background, a fish native to South America can most clearly demonstrate its delicate white-pink color with a golden glow. The main requirements for its comfortable maintenance are a small height of the structure, an abundance of secluded places and plants. The amount of oxygen is not so important, since adults periodically enter the upper layers of the water and jump out to replenish it. This heat-loving breed feels best at a liquid medium temperature of 23-28 degrees. Small (up to 6 cm) corridors are well compatible with haracin and other compact species.

3 Goldfish Oranda

For a novice aquarist, it is a matter of honor to purchase one of the varieties of goldfish. Oranda attracts attention with the unusual shape of the head part, which is commonly called helmet-shaped, beautiful translucent wide fins and a bright white-red color. This beauty looks spectacular in the aquarium and in the photographs. The breed was bred by breeding, it differs from all other helmet-like ones by the presence of a dorsal fin. The body of individuals swollen in shape is capable of acquiring a length of up to 20 cm. The underwater inhabitant loves a large amount of water, food, and the company of relatives. Therefore, it is necessary to maintain a properly dosed diet with a low protein content and start 4-6 golden individuals at once. The maximum life expectancy of an oranda is 15 years.

2 Red swordsman

This small inhabitant of the underwater kingdom is distinguished by a slender body and a characteristic caudal fin-sword. It belongs to the Pecilia family, the male in size can reach a maximum of 12 cm, and the female 15 cm. Aquarium owners opt for this type, as it is neutral to the composition and volume of water. For a couple of individuals, 6 liters is enough. The most useful for them is the temperature of the liquid medium in the range of 20-25 degrees. Swordtails prefer the middle and upper layers of water, so shows with them jumping into the air are quite possible. To prevent it, it is recommended to have a container with a lid. The fish perfectly tolerate the neighborhood with peaceful breeds, but the males of the species can compete with each other.

1 guppy

There are several varieties of guppies in size, shape and color. Therefore, those who are going to start this popular breed are advised not to place individuals of two or more different colors at the same time. The effect can be unpredictable. In general, the species is characterized by an average size of a male up to 4 cm, females – up to 7 cm. The fish feel good in all layers, quickly adapt to water. The best temperature for them will be the range of 18-30 degrees. The fish are ideal for living in hard and salty water. With rare exceptions, individuals coexist peacefully with the rest of the fauna. In addition to dry food, guppies are happy to eat plankton, small crustaceans and plants such as spirulina.

The best cold water fish for an aquarium

5 Danio rerio

The budget-priced option is great for those who are just going to install the first aquarium and have unpretentious inhabitants. The ancestors of zebrafish live in the rivers of Southeast Asia. From them, ornamental fish inherited the ability to adapt to an unfamiliar environment in a short time. Small (up to 6 cm) size, narrow body, beautiful striped color make it possible to populate entire groups of the species in containers. Moreover, even a 5-liter vessel is enough for them, however, the most active life activity takes place in an aquarium design from 30 liters, where water filtration and a temperature regime of 18-23 degrees are provided. This breed is distinguished by the fact that it does not seek food at the bottom.

4 Telescope black

Such an underwater bump is great for aquarium structures with light soil, plants and accessories. Against their background, each line of the relief body, fins is clearly visible. As if bulging eyes due to the upper growths give this representative of the underwater fauna a particularly expressive appearance. It is recommended to have fish to create a color contrast with the rest of the inhabitants. In addition, despite the size of 15-20 cm, they behave calmly, slow. Therefore, it is necessary to add breeds with a similar character to the company. Aggressive species and stickers can damage their fins. The most comfortable for the telescope is the water temperature of 15-25 degrees.

3 Barbus scarlet, or Odessa

The rating participant refers to species that have a natural, and not a breeding origin. He received from nature an attractive silver body color with a red stripe, which is complemented by translucent variegated fins. Barbus attracts fans of the correct form. He is friendly to other aquarium inhabitants; individuals of species with large fins can only cause irritation in him. For a comfortable stay, a fish up to 10 cm in size needs a container with a volume of at least 65 liters. In it, the barb is located mainly in the middle layers. Water should be used from moderately soft to hard in the temperature range of 16-25 degrees. The most advantageous individual looks against the background of dark soil or the back wall of the aquarium.

2 Ryukin calico

A representative of the carp family, a traditional participant in the ratings due to its excellent adaptation to the composition of the water. It practically does not react to hardness and salinity of water, it is perfectly active at a temperature range from 15 to 23 degrees. Ryukin prefers fresh water, oxygenated, natural light. A low capacity of at least 80 liters is suitable for it, since the size of an adult can be about 20 cm. On sale there are fish of the same color, as well as variegated or combined colors. The wide body ends with a 3-4-lobed caudal fin. Calm in nature, but curious ryukins love to dig in the ground. Therefore, for laying at the bottom, you should choose coarse sand or rounded pebbles, as well as plant the soil with plants with a strong root system.

1 Lionhead red

A variety of goldfish is popular with owners of small-capacity aquarium structures. For one individual, only 50 liters of water is enough. Inside, the interior of the container should be equipped with soil 5-10 mm, smooth stones and snags, behind which you can retire, artificial and living plants. The latter include hard-leaved and bushy, which are edible. The red lionhead is distinguished by a large body up to 20 cm in size, the presence of wavy growths on the head and unexpectedly small paired fins of a regular rounded shape. It suits the temperature of the aquatic environment of 18-23 degrees with a hardness of 8-25. To maintain the health of individuals, it is recommended to provide high-quality filtration and aeration.

The best fish for a freshwater aquarium

5 Labidochromis yellow

Fish, whose body length reaches a maximum of 10 cm, are great for peaceful coexistence with many other underwater inhabitants. They belong to the cichlid family, and are the best in character. Only breeds with a similar appearance can cause irritation in them. Rare for freshwater, the yellow color will become saturated if components rich in carotene are added to the feed. In total, about 10 shades of this species are known. Aquarists choose labidochromis for its bright color, unpretentiousness in nutrition, and love for a minimalist interior. They have enough strong filtration, fresh water with a temperature of 24-28 degrees. As a soil, it is better to use fine-grained sand or coral chips of almost any shade.

4 Handsome Chromis

Wild populations of decorative aquarium inhabitants are found in the Congo Basin. Chromis-handsome inherited from his ancestors a stubborn character, love for slow water, a large number of plants. Despite the average size of 10-12 cm, one fish needs a container of at least 40 liters of water. There she feels spacious, examining not only the succulent parts of plants, but also the root system. For complete comfort, this variety requires filtration and weekly replacement of 30% percent of the water. Chromis is omnivorous, moderately active. Individuals of opposite sexes can show aggression mainly during the mating season with dissimilarity of characters. However, they are very caring parents to the detriment of the rest of the inhabitants of the aquarium.

3 Koi

The decorative version of the carp family is distinguished by a variety of colors. In addition to the usual red, black and yellow, koi have received exotic shades through selection, which affects the cost of individuals. The fish have a body shape flattened from above, their size ranges from 12-17 cm. It is important that not only a glass aquarium, but also a backyard pond can be chosen as a habitat. Freshwater easily tolerate temperature changes in the range of 10-23 degrees, water composition of different hardness, irregular filtration. Nutrition can include both dry food and live, combined and even ice cream. The fauna of this species is characterized by a long life cycle.

2 catfish ancistrus

These naturally unusual fish with a patronizing coloration are very active, inquisitive and sociable. They prefer their equals in sociability, avoiding breeds that are too slow or scaleless. You will give them pleasure if you decide to have dense thickets in which they could be in rare moments of solitude. Catfish love oxygenated water, so powerful aeration is a must. The disadvantages of the species are the tendency to frequent clarification of relations between males and overeating. This can be avoided if you keep a male with females and adhere to a carefully compiled, predominantly plant-based menu.

1 Botsia clown

Botsia attracts attention with its contrasting striped color, wide size range (from 2-3 cm to 20 cm), and high communication skills. With a large number of positive qualities, this is a bottom fish that prefers the lower layers of water, as if hiding from prying eyes. Here she easily finds food due to the lower placement of her mouth. For her, it is necessary to prepare caves, grottoes, snags, in which the aquarium inhabitant could stay on vacation. The rest of the time, she sticks to a flock, so it is advisable to acquire several individuals at once. For this species, a capacious aquarium (from 100 liters) with water having a temperature of 21-26 degrees, where constant filtration is provided, is well suited.

The best fish for a marine aquarium

5 Mandarin colorful

The spotted inhabitant of marine aquariums is distinguished by a special charm of multi-colored coloring with a neon glow, an amazing combination of a slender body, fins-wings, expressive eyes. This variety is also distinguished by the fact that individuals prefer to lead a sedentary lifestyle. Despite the apparent inactivity, males have a high level of aggression towards male congeners. Therefore, it is better to have only one such fish or a heterosexual pair, adding representatives of peaceful breeds of suitable size (up to 8-10 cm) to it. Difficulties can also arise with feeding, since the transition to replacement food is slow. The life expectancy of the species is 10-12 years.

4 Pseudocheilin six-banded, or Pajama Wrasse

Such beauties in the natural environment can be found in several oceans at once. Moreover, the size of their body can vary significantly. In captivity, they are mainly used in sizes up to 5 cm for decoration of aquariums. By nature, wrasses are very independent, prone to loneliness, but at the same time they are mobile and accommodating with representatives of other species. Their activity occurs during the day, while at night individuals try to climb into a grotto or a crevice in stones for rest. It is recommended to keep fish in containers with a volume of 300 liters or more, where the water temperature ranges from 24-27 degrees. The bright color and graceful movements of individuals attract the attention of those who like to observe the life of marine life.

3 Zebrasoma brown

A flat underwater inhabitant is distinguished by a variegated color, easy adaptability to captivity conditions, and a high indicator of compatibility with individuals of other species. It has a maximum size of 10 cm, but requires an aquarium of at least 200 liters. She does not need active filtration, but the presence of optimal lighting is necessary. Zebrasoma feeds mainly on plant products, including aquarium algae. Therefore, smooth stones overgrown with greenery should be laid at the bottom of the tank. You can include in the diet and shrimp or squid meat. To maintain the health of the fish, water must be maintained in the temperature range of 24-28 degrees.

2 Thalassoma lunar

Nature rewarded this representative of the underwater world with bare skin, which has a shimmering greenish to blue color with red-violet patterns on the head and fins. In aquarium conditions, individuals grow up to 20 cm. They feel equally comfortable both at medium depth and at large. However, they need oxygen, so you should take care of aeration. By nature, these are cleaners that rid the fish of adhering parasites. In nutrition, they are unpretentious, preferring small crustaceans, frozen foods. Features of the species – when maturing, females turn into males and do not give offspring in captivity.

1 Apogon Cowderna tulle

The historical homeland of this small neat fish is Indonesia. It is in demand among aquarists for its silver-black color, which is complemented by luminous dots scattered throughout the body. The shape is also considered an advantage of the species, since, with a size of up to 10 cm, it differs in symmetrical relief, the presence of a set of predominantly narrow fins. Apogon loves space, despite the tendency to hang in one place for a long time in his favorite position. Therefore, for them you need to choose large aquariums, ideally reef. The water temperature should be between 24-27 degrees. In nutrition, individuals prefer food of animal origin, including frozen foods.