I used general cure that has metro but made no difference that's why I wondering if he has a whole different issue
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Okay, got it. Wat kind of filtration on the tank?
Also, I would think that IF Anything it would probably be some mort of Bacterial infection. And for that I would Defintely use Kanaplex! It's made by SeaChem and is a Fantastic product! it can be diluted in heated tank water and then administered right into the water. The Meds are absorbed immedaitely and directly into the skin of the fish. Interanl parasite woudn't make sense really as that is something more found in WC fish as an issue. I would be doing water changes of 50% every other day on this treatment. You can dose upto 3 times every two days and 3 more doses after that IF you don't see a change.
You could also smash some high quality pellet food into a past using 3% solution (1tbsp/2cups of Distilled water) and a little bit of minced garlic in with that. Then use a Syringe and Medical IV line to administer this to him 2 times a day for 3-5 days. See if that helps.
once again, these are Merely Suggestions and I take no responsibility for any issues caused from this treatment. although I don't see why it woudl harm the fish if done properly.