About 3 weeks ago my bettas tail fell off. I figured he had fun rot so I started feeding him more, cleaned out his tank completely, and have been giving him bettafix since then. He's eating again and he's very active but his fins are continuing to shrink! Right now they're a little smaller than those of a female betta, but they're very smooth at the edges and no longer tattered and ripped looking like they were before. How do I know if he's getting better? How do I know if I'm treating it properly, and how long do fins take to regrow? Is there anything else I can do to help him? He has a good size tank with no other fish.