Oxygen is also needed for fish culture in small fish tanks, especially when the feeding density is relatively high. It is definitely better to raise fish with oxygen than without oxygen, because the environment with sufficient oxygen is more beneficial to the breathing of fish, and can also promote metabolism and accelerate its growth. As for worrying about whether you will get bubble disease, you usually get sick only if you are saturated with gas, but oxygen is actually injected into air, that is, a variety of gases are mixed, which not only does not saturate the gas, but also allows some saturated gas to dissipate.

1. Lamp fish: Lamp fish is the abbreviation of Lamp fish, and there are many species of them, such as lotus lanterns, traffic lights, head and tail lights, red nose scissors and so on. Although different lamp fish are of various colors, their body shapes are relatively small, so they are very suitable for keeping in small fish tanks. Moreover, lamp fish are easy to raise, and they can swim in groups when they are raised more.

2. Guppy: Guppy is one of the most common small tropical fish at present. This kind of fish is not big and has a beautiful tail. Raising this kind of fish needs to pay attention to feeding some feed with coloring ability, so that it will become more beautiful. In addition, because of its mild nature, it is very suitable for polyculture.

3. Mary fish: Mary fish is a kind of fish with strong pollution resistance and can survive in an environment with low dissolved oxygen, so it is no problem to keep it in a small fish tank. This fish mainly feeds on algae and organic debris, and occasionally eats some aquatic animals. Marie fish in the wild generally inhabit freshwater basins and are also found in coastal waters.