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Yea but he seems to be doing well and no signs of stress going on 5th dayIs that fish in the same tank you're using cupramine in now from your other post? Puffers are very sensitive to copper, especially ionic copper like cupramine, and the treatment will likely kill him
Is it contagious?Unfortunately lympho is a virus and there is no cure. All you can do is feed a healthy diet and keep your water as pristine as possible and the symptoms may reside, but the fish will never be cured.
Is it contagious?
Exactly thisIt's a virus so it is contagious but fish with healthy immune systems are usually fine, copper is an immunosuppressant so that's probably why he's exhibiting symptoms. You should get him out of the copper and treat with chloroquine phosphate which is much safer for puffers. His condition will likely continue to decline the longer he's in copper

