I'm sorry, Watty! I just don't know enough about medications to really be comfortable with offering you advice. All I know is what I've read/seen from others battling these things, and they're a tough lot to kill. Maybe Gizmo would have more advice to offer you - she's been keeping Betta for a much longer time than I have, and I know they can be really sensitive to medications. All I would say is whatever you try, you should move the frogs before you do. They tend to be very sensitive to many meds, and to the best of my knowledge, are NOT carriers nor are able to become infected by most, if not all, parasites that affect fish. Their systems are too different, and parasites tend to be fairly host-specific as a general rule. . . I really wish I could tell you something more. Hopefully it's a GOOD sign that he's doing so well. Maybe you caught it early enough to knock them out before they get terrible. . . I've read of users using a med by Jungle Labs on the food - but the problem was that the fish wouldn't eat the stuff, so it really didn't do as much internally as they had hoped. It's a really nasty parasite, and tough to get rid of, so I'd go with the strongest med you can to get rid of it asap, and keep the substrate as clean as possible to avoid re-infection. . . *sigh*