halfmoon doubletail

Hello. I have a half moon (double tail?) with some deterioration to his fin. I was treating for fin rot but after researching more I'm not so sure what it is. Please help. Housing What size is your tank? 1 gal (med tank) What temperature is your tank? 78 Does your tank have a filter? Main tank...

Okay well, I promised no more Betta's because I really don't have the room left over. I have my divided 6.6 and have two unused smaller tanks- 1.5 gallon bowl, 1 gallon hexagon. These really aren't fit for long term betta keeping so that's why I never intended to get another fish. Too bad for...