1. Poor water quality

It is very common for black devils to refuse to eat due to poor water quality, which is usually caused by the aging of water bodies. If you don't add new water frequently, the water quality can easily get old. If the general filtration system is good, then the parameters of the measured water body may be basically normal. So, if you haven't replenished new water for a long time, and the Black Devil has a food refusal, you can change one-sixth of the water every day for 3 to 5 days. The food refusal usually occurs. will recover slowly.

2. Indigestion

If you accidentally feed too much, the black devil can easily cause indigestion and refuse the bait. In this case, you can change part of the water, increase the temperature, and add some lactic acid bacteria to promote digestion. At this time, you should stop feeding, and wait for the black devil to digest, and it will naturally return to normal after having an appetite, and then start feeding the bait slowly.

3. Anorexia

Frequently feeding a single food, the black devil may have anorexia and refuse to eat. It can be fed with live bait and feed to maintain the variety of black devil food, which is good for the appetite of black devil.