Cottonmouth disease. A white cotton-like mycelium grows on the snout of orange spines suffering from this disease, which is difficult to feed and swims slowly and weakly.

Oxytetracycline is used to make an aqueous solution with a concentration of 1/100,000, Soak the orange thorns in it until the symptoms disappear. Aquariums, fishing nets and other utensils should be immersed and disinfected with 0.1% formaldehyde solution. Or immerse the sick fish in a 5/100,000 bright green solution once a day for no more than 1 minute each time.