Ok I was in PetSmart today, looking around with my girlfriend and I happen to see this guy. Now to me it doesn't look like he has Fin Rot, I know about betta fish as I have raised them before, to me it looks like he has nipped his own fins almost off possibly from depression.
He was labeled as a Half Moon betta , but when I picked up his NASTY bowl he was in, i saw about 6 uneaten food pellets at the bottom and he was swimming around in his own waste, terrible!
In between his 2 front pelvic fins i see a small white bulge between them, this little guy is perky though and swims around a lot, My guess would be constipation but I am no expert although I do have a good deal of knowledge about them, this one puzzles me.
He will swim down no problem but stays mostly at the top so he can breathe, Judging by the amount of food in his nasty little container I do assume it is constipation. I hope you can see and tell from the pictures I have posted. This is NOT what a Half Moon Betta should look like and I will do everything I can to save this little guy.
Right now i have him in a hospital 1.5 gallon with a filter & heater, no gravel though, and I have added the correct amount of Aquarium Salt, But please if you have any suggestions as to what this small bulge may be i would appreciate it.