I transfered my black molly and 2 kuhli loaches from my 10 gallon to the 37g, 2 weeks ago. There were no signs of illness while he was in the 10, but gets ich once he's put into the 37g. I turned the temp up to 84 degrees. None of my other fish are sick and are quite healthy. I can't use salt due to have 5 kuhli loaches in the tank. What can I do? I tried the quick cure I have, which normally works when I turn the heat up.