Why are my fish still sick after velvet treatment, and tank has algae?

Question

Concerned about what possible skin diseases?? Some of my fish possibly may have. Is it a possibility that some just algae on them. I recently treated the tank with copper sulfate because I believed that fish may have velvet.. however two days later; the tank seems to have more algae in it and the fish don’t seem any better in appearance. I don’t know if they had velvet but thought using that treatment would’ve helped in this situation. But it didn’t so want to know that they have. Pet's info: Fish | Freshwater Fish

Todd Cecil · Accepted Answer

Thanks for reaching out. Have you tested water quality for pH, ammonia, nitrite and nitrate. Correct problems. Don't see any signs of external lesion on the pictures, except fine erosion, and possible gravid fish. A veterinary visit is probably needed to trouble shoot for disease. Randomly adding chemicals to the water could have detrimental effects. Good luck.

Why are my fish still sick after velvet treatment, and tank has algae?

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