Help! Didn't realize meds are unsafe for corys

[scriptora31]

Hi, I've kept small freshwater aquariums for years but have recently been battling problems with algae and disease. In the last couple weeks, two of my tetras (2+ yrs old) showed signs of white cottony fungus. UV filter seemed to take care of it and they were fine/clear, but then it showed up again with a vengeance. The next day, one of my platys started swimming sideways and demonstrating clamped fins.
I got Tetra Lifeguard and used the first dose last night ... but then I just realized it's not for scaleless fish! Did I just kill my corys?? They look fine right now, but I feel terrible and don't know what to do. I don't have a hospital tank (I know, terrible) but can go get one. Will this help? What can I do for them?

 

[Delapool]

Hi, I've kept small freshwater aquariums for years but have recently been battling problems with algae and disease. In the last couple weeks, two of my tetras (2+ yrs old) showed signs of white cottony fungus. UV filter seemed to take care of it and they were fine/clear, but then it showed up again with a vengeance. The next day, one of my platys started swimming sideways and demonstrating clamped fins.

I got Tetra Lifeguard and used the first dose last night ... but then I just realized it's not for scaleless fish! Did I just kill my corys?? They look fine right now, but I feel terrible and don't know what to do. I don't have a hospital tank (I know, terrible) but can go get one. Will this help? What can I do for them?

I think a separate tank is useful. May not be a problem, are they showing any signs of distress? Depends on tank maturity, meds, water condition and size / age of fish. Any concerns then I'd do a 50% water change to reduce meds level.