wrasse fins

So I am in need of help. About 3 weeks ago I lost a fairy wrasse in qt to what I thought was a bacterial infection so I started treating the rest of the fish in the quarantine tank. One of those being this leopard wrasse. Now almost three weeks later of medicating the tank I am almost certain I...

I dont have pics at the moment but what would cause a fish’s fins to literally curl at the edges and otherwise shorten? Our ruby longfin fairy wrasse was living in our copper/low salinity systems for a good few months, we were expecting him to sell faster, I eventually moved him to the normal...