09-12-2011, 11:58 PM
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It's just my opinion, but I believe that a fungus problem in a fairly new setup can be fairly common. I had a fungus problem with my black mollies when my 60g setup was 'fresh'. The other fish (Platy's and neon tetras) were fine. I think there's a lot going on in water chemistry on the 'road to the established tank' as all sorts of bacteria and fungi develop and stabilize. I 'cured' my mollies in a hospital tank, only to see them have fungus signs again not long after I moved them back to the main tank.
You've already treated the victims and the tank. Continue with your water changes (I'd do 50% twice weekly for now), using a good conditioner, and be patient. Resist any urge to add more medication to the main tank - it has other negatives. Treat severe patients in a hospital tank.
Now if/when I see any signs of fungus, I wait and let nature have a chance for a cure.