Just bump up the temp to 85-86 and it will take care of it in 7 days. If you can do daily water changes at around 50% then that will help get rid of the free floating particles and prevent it from growing again but the Ich cannot live in those temperatures and will die in a complete life cycle in 7 days so that's the easiest, least stressful way to handle Ich! I've done that for my 33 sorority and worked super well!!
Rembrandt II, Suiché
Leopards: 1:4 Hawkeye, Luna, Astrael, Dorian, Cullen
Gargoyle: Cloudjumper and Toothless