I currently have three clown loaches who live in a 55g tank with about a dozen other (mostly small) fish. Within the past week, my largest clown who is normally very active and robust has become lethargic, breathing hard, has no appetite, and is flashing occasionally. I've tried using a half dosage of parasite clear fizz tabs by jungle, which didn't seem to help. I've also purchased some medicated fishfood for parasites that he won't eat. I'm not sure what else to do. Even though there is no indication that he has ick (haven't seen any spots whatsoever), I can't think of nothing else but to turn the heat up to 88 degrees (it is normally set at 82). I normally do a small partial water change of approx 10% every day, and a gravel vacuuming every other day. My ammonia and nitrate levels are at zero. Any ideas about what might be wrong with my sick loach, or how to treat him?
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