Thank you for your suggestions! This is really late, but just an update. I been having some success!
Unfortunately, most of the ones I had when I wrote the last post died. I moved the few survivors to my second quarantine tank. But I had noticed that just salt and a little melafix seemed to work on some guppies. So I sterilized my tank and bought some more fish. A few of the very diseased ones died just a few hours/a day after I got them home, but the rest are doing so much better than before. Two that had very clamped/rotting fins have actually gotten alot better! Their fins are unclamped now and grow back (which makes me so happy).
I'm not sure what exactly is making the situation better than before, but some of the changes that I made were: instead of chemical medications (trisulfa, blue ick cure), I just added some salt (about a tablespoon for the whole 10 gallon tank) and a little melafix (about half of the recommended dose). Also, I had a lot of leftover baby brine shrimp that I hatch for some of my fry, so I fed them to this tank. I think the most important factor that changed was the medications. Perhaps the chemical cures actually made the fish more stressed and caused their condition to worsen?
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