Yeah, unfortunately, that's definitely possible. I'm not really sure of the best solution given your situation because of the size of your qt and the number of fish you need to have in there. Obviously, the best solution would be to get a bigger qt so that you can perform the bath procedures and then keep an eye on them for a few weeks while your main tank is void of hosts. I'm not sure if that is a viable option for you. If not, you may have no choice but to do freshwater baths and return them to the main tank. At least the bath will remove the spots that are currently on the fish showing signs of ich. You can see them fall right off. Then watch the fish to see if it comes back again. You can always repeat the procedure if you need to. You may find that your fish recuperate just fine and only one or two may need the qt, which will be much more manageable for you. Ich, from what I understand, is kinda always around; it's just that stress will cause it to rear it's ugly head. Making sure there are no hosts for at least 4-5 weeks will destroy most of the free swimming forms of it, but I think you will definitely stress your fish out more by having them in such close quarters for this long. I just think you may have better success going this way. Also, see what Beth says, she is really knowledgeable with disease treatment. I'm sure you know, but double check your water quality, temp, and anything else you can think of that may have caused stress to you fish just so that you don't do all this for nothing, and of course, so that your fish will be okay for a much longer time. Good luck, and I HTH.
