If you need to populate a small aquarium with fish within thirty liters, then you need to know a few rules.
Some important rules
The first rule. Fish for a small aquarium should not be predatory. Often acquire fry, not thinking what sizes they will reach when they grow up. Therefore, you need to ask the seller about the maximum dimensions of an adult.
The second rule. Fish for a small aquarium should not be rare and expensive. In such containers it is difficult to maintain a stable desired mode. In case of violation of the ecological balance (for example, due to excess feed) they are the first to die.
The third rule. No need to get a lot of fish. One individual 5 cm long requires approximately 4 liters of water. Easy to count: unpretentious fish for a small aquarium with a volume of 30 liters in an amount of 7-8 pcs. will feel quite comfortable.
Rule Four It is not necessary to start individuals very different in behavioral factors . For example, some fish are constantly moving, while others are inactive.
The fifth rule. It is necessary to start fish taking into account the uniform filling of the vital volume. For example, territorial individuals can occupy a larger capacity space, which will cause great inconvenience to other inhabitants. In addition, the fish need to be combined vertically so that overpopulation of one of the layers of water (bottom, middle, top) does not work.
Types of fish for a small aquarium
Viviparous
The most common is an inexpensive fish for a small guppy aquarium. If you wish, you can find beautiful specimens of intricate coloring. Swordsmen of different colors feel good in such containers. They are red, black, spotty, green. In addition, swordsmen and guppies can coexist well together.
Another small fish for a small aquarium is black molliesia. It is more demanding on the temperature and mineral composition of water. Therefore, it is slightly salted. Particularly spectacular are disk red pecilia. All these fish are similar in terms of keeping, feeding and caring.
Caviar
The striped Sumatran barbus looks very good, especially the mossy barbus - a mutant of green color.
The zebrafish are small and completely unpretentious. Cute veil cardinals are also small in size and suitable for such containers.
The smallest fish for the aquarium, perhaps, are neons of the haracin family, but they cost a little more. But neon (red, blue or ordinary) is considered the most spectacular fish among all freshwater flocking representatives. A flock of 10-15 individuals will become a real decoration of any aquarium.
If you want to buy larger fish, then you can stay on a pair of angelfish or parrot pelvikahromisah.
Small catfish (gold, speckled, green) get along well with any fish. They live in the bottom layer, feed on the remains of feed at the bottom, thereby cleaning the soil. And catfish-ancistruses, due to the structure of the sucker-mouth, clean the walls of the aquarium from algae deposits.
The number and composition of the inhabitants of the aquarium depends entirely on the preferences and availability of the finances of its owner.