in the flow of

fish tank water? Because in the process of flow, the water surface will contact with the air, which can bring part of the air into the water, thus improving the dissolved oxygen in the water body. It is worth mentioning that this method of oxygenation is not efficient and the oxygen increased is limited. If small fish are raised, they may be able to meet their breathing needs, but big fish are not. They still need a special oxygen pump to oxygenate 24 hours without interruption.

2. What kind of fish has a low

demand for oxygen? 1. Guppy: Guppy is a common small ornamental fish. Its body length is less than 5 centimeters, but its tail accounts for a large part. Because of its low demand for dissolved oxygen, fish can grow healthily even if there is no oxygenation equipment in the tank.

2. Zebrafish: Zebrafish is also small in size, and its demand for oxygen is relatively small, so it can be fed without oxygenation in the tank. This kind of fish has a mild temperament, is easy to raise, is suitable for swimming in the environment of 20-23 C, can even tolerate the low temperature of 11-15 C, and does not require high water quality.

3. Betta: There are many kinds of betta. The common Thai betta belongs to tropical fish. In addition, there are round-tailed betta, fork-tailed betta, etc. No matter which kind of betta belongs to the fish of the family Gourami. The fish of this family have suprabranchial organs, so they can breathe on the surface of the water when the water is anoxic.