To add on to above, raise the temp a couple degrees first BEFORE medicine. Do some water changes every couple days to get rid of the ich before it attaches to the fish. For a week or two and its still there try raising the temp a bit higher or go to meds.
Ok I don’t know what’s happening but all of my fish are now dying! None of my fish will eat. I did a water change yesterday to get all the uneaten food up. The temp is 82 I tested my water and went to the pet store and got it tested and both came out perfect. 6 of my fish died yesterday and my catfish is looking really rough..his whiskers look like they are deteriorating please help me save the rest of my fish!!!