The white hair on the fish is caused by water mold. This is a common disease, usually caused by water mold or cotton mold, but besides these two kinds of bacteria, there are other pathogenic bacteria. Usually, germs invade the fish's wound, and then grow hyphae from it to wrap the fish, which looks like white hair. If you want treatment, you should first heat up properly, and then you can soak and sterilize with drugs.

1. Stop feeding: Generally, after fish suffer from water mold, it is necessary to stop feeding immediately. At this time, the fish lose appetite and don't eat much after feeding, and it will pollute the water quality, which is very unfavorable to the recovery of fish. Don't worry about the fish will starve to death, it has strong hunger tolerance, and it is ok to feed it after being cured.

2. Change water to heat up: This disease is easy to suffer from in low temperature season, and the water quality is often poor, so in order to make fish recover as soon as possible, the first thing to do is to change water to heat up. The water is usually changed every other day, so as to improve the water quality as soon as possible. The temperature should not rise too high at one time, but at 2 ℃ every day.

3. Drug soaking: If you want to cure water mold, you still need to soak with drugs. It can be soaked in formalin at a concentration of 100-250ppm for 1 hour, soaked in 1-1.5% saline for 20-30 minutes, or given some antibiotics and other drugs.