What is growing on my chalk bass?

[Toxic Slurpee]

A couple days ago I noticed a small growth on his underbelly. It's been getting larger. His behavior hasn't changed and he's still eating & crapping like usual.

Any ideas?

 

[Toxic Slurpee]

Bump, any ideas?

 

[downbeach]

Gas Bubble Disease?

http://www.ultimatereef.com/articles/bubble/

http://www.koi4u.co.za/index.php?op...se&catid=10:non-contagious-diseases&Itemid=20

http://www.reefs.org/library/article/cripes_kowalski_phipps.html