Just thought I would update this and let you guys know how this fish is doing, and to say thanks for the help. I'm happy to say the lab is doing MUCH better now. I treated with Metro for about 10 days, also added some salt every PWC for about 2 weeks, eased up on the feeding and skip feeding one day each week. The lab is now pretty much back to normal size with almost no bulge at all now in his/her belly. The coloration is a bit faded from what it was before, but health wise it pretty much looks normal now, eats well, and seems to be doing very well
