Master Fish, please come in.

First of all, the first point should be that the fish density in your aquarium is too high, so you can eat more Dora, which leads to excessive defecation and deterioration of water quality. The second point is that you were lazy at first. You should have changed the water earlier, but you couldn't keep up, resulting in more impurities in the water. In addition, hot weather and high water temperature lead to the rapid deterioration of water bodies. Later, if you change the water frequently, you can't get immediate results, and the disease comes like a mountain, and the disease of this water body is also very serious in fish farming. The third point is that the flow and suction of your filtration system are too small, and the whole filtration system is too low, which leads to the consumption of nitrifying bacteria and impurities in water is not proportional.

Prescription: add a set of filtration system, and don't be afraid of more equipment if you want more fish. The bigger the water body, the more difficult it is to have problems with filtration. The next step is to keep it for two days and replace one-fifth of the trapped water, pump more impurities into the bottom of the fish tank, and the filter 24 will disappear continuously. Clean up the filter cotton at the top of the old filtration system, and the rest is waiting.

Don't use any water purification drugs unless you don't want your fish.

Note: "Nitrifying bacteria are hyperoxic bacteria, and there is no special temperature limit, so no matter how hot the weather is, there will be no large number of deaths." People in the aquarium may not understand that the characteristics of nitrifying bacteria can't be trusted. If nitrifying bacteria can survive well, at least the water flow cannot be broken, and it depends on the water flow to survive! "