I need to raise the temperature due to one of the fish having Ick. Mostly African and one SA which is the one who is showing the Ick. Right now I'm going to raise it from 78F to 80F, how high can I safely gradually raise it to? I've decided to just raise the temp instead of medicating the whole aquarium (55G). Also the tank does have a long air stone on one side, will I need to add more?