1, invertebrates

Small fish tanks can choose to keep some invertebrates, such as snails, crabs and shrimps. These invertebrates have less pollution to water quality and can increase the ecosystem in the tank. However, it should be noted that these invertebrates also have predation and other relationships, and they need to be reasonably matched to avoid excessive predation.

2. small fish

Small fish tanks can also choose to keep some small fish. Such as goldfish, peacock fish and tropical fish. These fish will purify the water better and have brighter colors. However, it should be noted that the density of fish farming should be appropriate and not too crowded, otherwise the water quality will easily deteriorate.

At the same time, the aquarium for tropical fish culture should be equipped with heating equipment and filtering equipment to provide suitable water temperature, light and water quality environment.

3. Aquatic plants

Aquatic plants are also a good choice, which can regulate water quality, beautify fish tanks and provide places for cultured organisms to grow. Such as duckweed, duckweed, aquatic plants, green radish and so on. However, it should be noted that aquatic plants need proper light and oxygen supply, otherwise they will die easily.

4. Microorganisms

A small fish tank can also keep some microorganisms, such as Daphnia, Hydra and so on. These microorganisms play a very important role in the regulation of water quality, and also make an important contribution to the ecosystem in the tank.

However, it should be noted that the number of microorganisms should not be too large, otherwise it will have a certain impact on the survival of other organisms.

To sum up, a small fish tank can raise some invertebrates, small fish, aquatic plants, microorganisms and so on. However, it should be noted that the cultured organisms should be suitable, not too crowded, and should be reasonably matched to avoid mutual predation and influence.