Please Help. Sail Fin Problem

[crazievegg]

:help: I Posted these in the disease and treatment thread and I still haven't heard anything in almost three days. Can someone please give me an idea. I don't want to lose my sailfin.
https://www.saltwaterfish.com/vb/showthread.php?t=238378
It started off about a week and a half ago. Over the last couple of days it has gotten worse. (I think)
He visits with the cleaner and fire shrimp almost all day but eats fine. Any ideas.
Below are Days 1 (1 Picture), 2 (2 Pictures), and now 3.
I just joined this site and see all the help everybody gets. Someone has to have an idea about what is is.

 

[renogaw]

i'd suggest only working one thread on the problem. head back there and give a little information on your tank, the other tankmates, and your water parameters. beth is very good, but unless you give her this info she usually can't help.

 

[fishgeek01]

personal opinion looks like the feeding spot for a parasite, either internal or external have you tried hypo in hospital tank or a qt