Guppies generally don't have much problem without oxygen at night. Although they belong to tropical fish, their oxygen demand is relatively low compared with other fish. As long as the feeding density is normal, there will be no other problems without oxygen at night.
However, if the number of breeders is too large, it is recommended that breeders take oxygen 24 hours a day, otherwise they are likely to suffer from hypoxia. But at night, try to reduce the power of the oxygen pump. In addition, try not to choose the time when guppies eat oxygen, because the current of oxygen will affect their eating.
2. Can guppies sleep when they are aerated at night?Guppies sleep when they are aerated at night, because they all live in a relatively gentle water flow in the wild. Oxygen is easy to increase the water flow, and guppy will enter a state of rest at night. If the oxygen pump is kept on at night, the breeder needs to constantly resist the water flow and cannot rest better.
If breeders want to get oxygen at night, they can put the oxygen pump above the fish tank. Because they usually move in the middle layer of the fish tank, they rest in the lower layer of the fish tank at night. Oxygen in the upper layer will not have much impact on them, so that they can be oxygenated at night without affecting their normal rest.