My fish have large open sores on their bodies, what is going on?
Open sores or large pimple-like lesions on the side of a fish are often a result of Ulcer Disease. This contagious and often fatal disease is difficult to control and needs aggressive treatment. Fish that are under environmental stress or are living in poor quality water have a good chance of contracting the disease. Correcting the water quality issues and treating with a product such as Melafix will likely take care of the problem.
