fin deteratiin

Can anyone tell me what is going on and how I can fix it

Hello All - About a year ago I had to move out of my home and put my 90G in storage. In the meantime, I set up a holding tank for my yellow tang and corals. The yellow tang has never really been on the fat, heavy side but always ate anything I put in the tank. The tang is not large and has been...

I have a 93 gallon mixed reef that’s been set up for about 2 years. Everything is doing great except for my yellow tang. I bought him about 1 1/2 years ago when he was about the size of a half dollar. Soon after I purchased him his dorsal and anal fin began to recede evenly.. and now it has...