How do you treat physical damage to your goldfish?

if your fish appears to be scratching itself against other objects, or keeping to the corner, chances are that is is infected with "ick." it is also known as Ichthyophthirius. another sign of ick is that small white specks are visible on the body of the fish. it can also be visible on the fins. since ick is a parasite, it is easily cured by ick treatment that can be found in pet stores. this is a fairly common situation.