I have a 30 gallon tank that I just bought a heater and thermometer for. I had a platy come down with what I think was Ich two days ago (I'll attach a picture). I'm slowly raising the temp up in the tank but I have a rescued fancy goldfish in there right now. Will he be able to handle the temperature being high while he's treated as well or should I move him into my 10 gallon QT tank? This is my first time keeping fish and I'm currently battling my family's belief that doing water changes kills fish . Any help would be really appreciated the only Ich I've seen before wiped out half of my moms tank one year it was devastating!