If no to those fish, get some Kordon rid ich plus or Hikari ich-x and treat according to directions. If it's a fungus that med will knock it right out. If it's bacterial, you might have to use antibiotics like Api furan-2 or E.m.erythromycin. both work really well. Try the fungus med first tho. Fungus/ich med is rough on those aquatic friends i listed, so you'll have to use a half dose