Blue Dot Jawfish with fluid filled fins

[Debbie2]

I recently purchased a Blue Dot Jawfish and have noticed the Dorsal and Anal fins are filling up with what appears to be fluid. This "disease" is progressing and the fins are now so full and thick that I can see what appears to be the fleshy part of the fish when looking through the translucent fins. The fish is acting as eating normal. It is a quarantine tank.... the two other BDJ that I have in my main display tank are healthy and doing well. I have never heard or aeen anything like this. Any help would be appreciated. I'll try to attach photos.