I just noticed that two fish in my rm's community tank appear to have ich (she feeds and I clean, but she's been busy lately so hasn't been paying as close attention as usual). I would like to treat the entire tank both because if more than one fish is sick they've all been exposed and could get sick and because I don't currently have a tank for an iso tank - I've been preparing for moving this summer and everything is being disassembled. My problem fish is the loach. The cory has been moved to the goldy tank, as he is mine and won't be going with my roomie this summer (he'll be going with my goldy to a different friend... btw I'm going to Alaska, that's why all the frantic rearranging of tanks). I don't want to hurt the loach with the meds I need to use on the other fish, especially as Chaos is the rm's favorite fish, but I also don't want to move him to the one tank with space for him, and expose my other fish. Especially this close to moving, as that will be very stressful for them anyway. We're also flat broke at the moment, so we're limited on what we can use to treat the tank. I have Furan 2, tetracycline, and malachite green. Are any of these products safe to use with a loach or, alternatively, would it be safe to move the loach to a one gallon for the duration of the treatment? I can probably rearrange enough filters to get a box filter in the 1 gallon without risking my other fish. I need advice asap so that I can treat the mollies and get them healthy before finals week. Thank you in advance.