What does a red spot on a goldfish's tail mean?

Answer by  bouldy (38)

A red spot on a goldfish's tail is a sign of illness. It means that the goldfish might have some soft of parasite like lice.

Answer by  kirri (478)

Red or White spots on fish are a sign of Ick. This can be easily remedied by keeping tank water levels correct. Medication for the disease can be bought at your local pet supply store. Coppersafe is one of the best brands to use for quickly remedying many fish diseases.