02-01-2008, 12:45 PM
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I would say this is either Cotton-Wool disease, or Fish-Fungus- both fungal fish infections which form as white cotton tufts on the outside of the fish. If not treated early, these can become an internal infection as well, so it's best to treat quickly (which may explain why the last one didn't make it). Methylene blue can be overrated, but it is good at starving the fungus of light, which will kill it. Unfortunately, with fungal skin infections, secondary bacterial infections are common. If you manage to stop the fungus, or if the meth blue is not working, I would recommend a round of Bettafix (diluted Melafix, you can do this yourself by adding 10 drops of Melafix/gallon). Just make sure you change out all of the meth blue water first, as I don't know about drug interactions.
Melafix is a general antibacterial. It greatly helps speed healing and prevents infection and scarring of these wounds.