Can anyone offer any suggestions. I have a blue margin fairy wrasse that looks like he’s losing scales on one side. It started just around his tail. I haven’t tried to treat him as he’s still active and eating aggressively. I went on vacation for a week and when I came back it appears that the same thing is happing on his side towards the center of his body. Could this been an infection of some sort? He is in a 10 gallon QT with two cardinal fish (which are fine). Still eating normal. Any thoughts on what this could be? Thanks for your help.