Add a bucket of tap water to the fish tank in summer, and then the silver dragon dies and the water is mixed.

I don't know what is the water change cycle of your cylinder? Generally speaking, the sweeper is not easy to die. If the sweeper dies, it means the water quality is poor. The cause of death of the sweeper is basically poisoning. For example, if you add salt and water purifying agent, you can do it without changing water for a week. Because the accumulated nitrate is too much, it is very harmful to the bottom fish. If you can change 2-3 barrels of water every week, it will help the evaporation of nitrate. Remember that 1.2 meters of water tank is nothing if you only change a bucket of water.

Besides the excessive nitrate in water, the problem of Arowana may also be caused by the stimulation of water temperature difference. If you struggled from beginning to end before you died, you can be sure. Therefore, the dried water can only be added if it is consistent with the water in the tank, otherwise such an accident will happen again in the future.

In addition, I would like to ask if your cylinder has only one upper screen. After reading your description, it should be that the filtration capacity of the original tank is very low, and it is difficult for water to achieve the ideal effect. Jiabao's water tank is average and the filtration is very poor. Your tank is a big fish, so it is necessary to equip it with an external filter tank. It needs 35 watts of power, and the brand should not be Jiabao. There is something wrong with the quality of Jiabao's barrel-sealed apron. It is very good when it is new. After several months, the apron will become hard and unsealed after alternating cleaning, resulting in water leakage. In fact, you have an arowana water quality alarm (blood parrot) in your tank. If you find that the parrot is light in color, you need to change the water. Well, I've said so much. I hope your fish is getting better and better.