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Answered 2009-10-25 23:11:46

Red spots on goldfish usually indicate the beginning of the formation of ulcers. They were probably caused by flukes (parasitic flatworm) which means you'll have to treat for parasites. The easiest way to eliminate the problem of ulcers is to start the fish on an antibiotic food, add an antiparasitic medication to the tank water, and to raise the salt concentration to 0.3%. The antibiotic food will take care of the ulcers, the antiparasitic will kill off the parasites that are leading to the ulcers- salt will also help kill off the parasites.

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