It is usually caused by not eating. Reasons for not eating: The suitable water temperature of Egyptian angelfish is around 28℃, and too high or too low water temperature will affect its eating. Strict requirements for water quality, weak acid water quality is the best, and the PH value needs to be controlled between 5 and 6. If the water quality is not suitable, it will also affect eating. If the water pollution is serious, it will cause enteritis, damage their digestive function and lead to their loss of appetite. If the bait is not suitable, it will not eat.