I have recently (9/20/08) purchased a betta fish (named Scoober) as a new companion. He's from Petco and I picked him because he seemed the most brilliant in color and the most active. As soon as I got into the parking lot, however, I noticed that the edge of his left gill cover seemed to protrude strangely. I had been the last customer in the store before it closed so it was too late to take him back--and so I decided to take him home and care for him strange gill or no. He immediately adjusted to his new environment. He's very active and has a healthy appetite. After reading about Betta disease, I was afraid he had gill flukes--but he doesn't rub or flash against his aquatic plants. Then I thought maybe his previous environment had poor nitrate levels. If so, wouldn't both gills be inflamed? Then I thought maybe he has a gill infection. The gill is a bit red. I don't want to mis-diagnose and mis-treat him...so I thought I would get opinions/suggestions before adding a parasite remover/nitrate level fixer/ or anti-biotics. HELP! Even though he behaves in a healthy way, blows a bubble nest, and doesn't seem to breathe heavily, I want his strange gill to get fixed. ^_^ THANKS!