Clownfish with "stuck open" mouth

[cl2ysta1]

I have a true perc that is in QT right now that's mouth appears to be stuck open. the area around it seems very swollen, and i can make out tiny red specks here and there in the same area. It seems to be eating/acting fine, but it looks like it swelled so much its bottom jaw is almost broke!
It is in QT right now with several other fish out of my 120 b/c we had an ich outbreak. This fish however never had ich. Only the Powder blue and a purple pseudochromis. This clown had this problem slightly before QT, but now it has intensified.

This is a freshly set up QT
I am slowly lowering salinity. It has been 3 days and I still dont have it where it needs to be.
The PH is 8.3 i have been monitoring it, and added a buffer when it dropped a little.
the other inhabitants in this tank are:
Purple tang
Powder Blue Tang
2 Neon Cleaner Gobies
Purple Pseudochromis
Yellow watchman goby
Lawnmower blenny
another true perc
and a onyx clown

I did a search online, and found many other people posting with the same problem, but no one had an answer.

Two questions:

What is it?
and
What do I treat it with.

thanks in advance
Crystal

 

[melissa77]

i had the same problem with one wild caught occ, 2 weeks ago, with the swollen jaw, he had 2-3 white studs around the mouth, i put him alone in a 10g with PARASITE CLEAR, a parasite treatment i got from a store in burlington vermont, i am from canada and cant get that here.... 4 days later everything was fine, and his jaw is back to normal, good luck with yours,

 

[cl2ysta1]

ok so than it is probably a parasite. Thanks. This is a wild caught also.