How Long for Black Spots on a Parrot Fish to Disappear?

Whether black spots on a parrot fish fade and how long it takes depend on the cause; if genetic, they will not disappear. If caused by external factors like poor water quality, they generally can fade, and the owner should change water promptly and keep it clean, after which the spots gradually fade. Also, a sudden loud noise can frighten the fish and cause black spots, so keep the water clean and the environment quiet to reduce their occurrence.