I've quaranteened my sick Julii cory that has fin rot (actually I think it is something else). I'm treating with Melafix in quaranteen and I'm also treating the tank the sick fish came from. The other cory doesn't seem to have a problem. My lfs has some new Sterbai corys that I am obsessing over (I saw them when I went by the other day to get supplies for sick cory). Is it a good idea (and it probably isn't) to place an expensive Sterbai in this tank where the sick cory had the fin rot?