White spot disease. After the small melon insect invaded the skin of the Red Sea Knight, the skin of the diseased fish increased in mucus, and a dense layer of white spots could be seen on the fish's pectoral fin, dorsal fin, caudal fin and body surface skin. In the early stage of the disease, the diseased fish gather in the corner of the tank and rub against each other. In the later stage of the disease, the diseased fish floats sluggishly on the surface of the water, feeding bait and not eating.

Control method: The water temperature can be slowly raised to 28°C, after a few days of resting, the small melon worm cysts begin to fall off, and new water can be replaced in time.Red Sea Knights recovery. You can also use 0.05-0.07% red mercury liquid in 10 kg of water, put Red Sea KnightDipping for 5-10 minutes.