fish. It may be because the temperature is too low, the water quality is too poor, or the fish is sick and not treated in time. If the temperature is too low, we need to pay attention to heat preservation in peacetime, it is better to use a heating rod to control the temperature continuously, and the water temperature should be maintained above 20 C. If the water quality is too poor, it is necessary to change the water for the fish regularly, usually once every three or five days. If it is caused by illness, regular observation is needed to see if there are any signs of illness, and medication should be taken according to the condition of illness.

Two, how to raise tropical fish will not die

1, daily feeding: want to raise live tropical fish, first of all to ensure feeding. Feeding should be neither too much nor too little at ordinary times. Too much feeding will accelerate the deterioration of water quality, which is very harmful to the health of fish, and too little feeding will lead to the lack of nutrition. It is usually fed three times a day, and each feeding should be finished within 3-5 minutes.

2. Change the water regularly: In order to maintain the water quality, it is necessary to change the water in the fish tank regularly. Even if there is filtration equipment, the ammonia nitrogen in the water will still increase, so the water should be changed once a week, and one fifth of the water can be changed each time. When you change the water, you need to pump the water first, and then you can pour the trapped new water into the tank.

3. Pay attention to the temperature: Since it is a tropical fish, there are certain requirements for the temperature. The lowest water temperature should not be lower than 20 ℃. For some large fish, the water temperature should be higher, at least above 24 or 26 ℃, and some even reach 28 ℃.