Looking for a diagnosis!

[gregzz4]

Glad she's still showing some progress. Getting your NO3 to 0 might help with stress. As for treating the other fish, you may want to avoid that at this point as there is no reason to put undue stress on them, thus lowering their immunity. If they aren't showing any signs, I'd leave them be. Just keep a REALLY close eye on them. Take pictures everyday for reference. Then you'll know for sure, instead of "Hmm, did I see that yesterday or not?"