sweetlips upper fin receding

My spotted sweetlips has been doing great for the last two weeks that we have had him. He is a great fish and gets along with all the other fish. The last two days though I have noticed more of the bone part of his upper fin exposed and it even looks like its effecting the base near the body. I really dont know what could be making his fin look like this. There are no powerheads to hurt him or any fish that would hurt him because he is the largest in the tank.

All params are in check and he is eating like a pig. Im just a little worried because Im leaving on vacation tomorrow and leaving the tank in the hands of my mother in law for 5 days.

 

I cannot help specifically on that issue however I do know they usually dont do well inside aquariums.

 

Well he died while I was gone... Sucks

 

Sorry to hear that.I would not replace him they grow to almost 3 feet in length and need a minimum 300 gallon tank.Expert only.