Stress coat. That is the best thing you can do at this point. It will help make the water better, replace the protective coating that was likely removed when your fish was pulled out and it will help the scales regrow.

http://www.aquatichouse.com/Water%20Conditioners/StressCoat.asp

Most any aquarium or pet store should carry it.

Betas commonly hover at the top of the tank. Eating/showing interest in food is good. But it sounds like he is pretty beat up. The biggest worry right now is likely infection.

Just don't bother him. The worst thing you can do is keep looking at him and checking to see if he is alive. If he lives he lives, constantly tapping on glass etc. will just cause more stress.

Keep the temperature constant and around 80 degrees. Big temp swings overnight can cause a lot of stress.

Bad signs would include swimming in a non vertical orientation (upside down or sideways). Swimming backwards isn't that big of a deal.

I hope he makes it!
Source(s):
http://www.bettafish.com/betta-fish-care-faq.php

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