Hi all, Im starting up my first betta tank (5 gal, planted) and working on getting it cycled now. Ive come to this forum a lot during the process for help on what to do. Now I've found a fish on Aquabid that I really like and placed a bid on, but I can see a bump on its side. I know betta's can get tumors, do you think that is what this is? Or is it just his tail muscle? Please take a look and give me our opinion. Thanks so much! Ive attached a pic.