Many fish illnesses (pop eye, fin rot, cloud eye, open sores, body slime, etc) can be treated with melafix. It is safe with inverts, but seems to do best in a concentrated "dip" in a clean bucket. De-chlorinate some warm tap water and add a dose of melafix into the freshwater. Dip your fish in the mixture for 5-7 minutes. take them out and plop them back into your tank. I have been dipping my fish for years and they all love it - kinda like a refreshing bath for us. Hope this helps.
-Dr Marco:sfish: