05-21-2012, 11:20 AM
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Obviously, since you put the infested fish in the 30 gallon, you'll need to treat that tank. I've had ich once, and it lasted for almost 2 months (I was treating for three weeks after that, so the whole experience for me was two and a half months of exhaustedness). I started out with the meds for a month and a half, with no success. I just raised the temperature a few degrees (I have subtropical fish, so the "heat treatment" wouldn't have worked with them), added a little salt, and kept vacuuming the gravel. Spots were gone in less than a week, and haven't returned 6 months later. Whatever you do, be sure to continue it two-three weeks after the last spot disappeared, since ich parasites reproduce on the gravel, where it can't be seen.
The most important thing is vacuuming the gravel. That is the only way to get the parasite out of your tank, when it is at its most vulnerable stage- after it has broken out of the fish and is ready to multiply.
The main reason why I'm against meds is it stresses out your fish, making them more vulnerable to ich and other diseases. Most of them don't really work anyway (the ones that work best kill plants, and they all kill snails/shrimp/etc.).