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Probably, but if it's developed fin rot, you likely need to address the root cause in the main tank as well. Usually clean water will correct it. Tell us about the tank and it's inhabitants if you don't mind.
its a 36 Gal, parameters are good , 2 weekly water changes 25 and 50 percent. I have 6 barbs, 5 black skirt tetras, 6 neon tetras, 2 platy, 2 Cory and 2 kuhli 's. Small water sprite 2 small pieces of driftwood. AC 50 and top fin 20. I'm on a budget so I haven't upgraded my filters
That sounds good. Are you sure of the fin rot diagnosis? Possible wound? IME, fin rot or wounds will respond on their own in clean consistent water while medicating in a throw together QT usually just stresses the fish making them more susceptible to everything. Has the problem been getting worse?