It's in their genetics to have bits of their fins curl, so it's okay.
Hmm, did you cycle the tank before putting him in? Is there a filter? Did you check the water parameters? How big is the tank? Did you condition him to his new tank before you put him in? What types of ornaments did you put in the tank?
Some bettas do find a large tank stressful because they have more area to patrol. Also, they prefer shallow water tanks, Anything too deep, they might find stressful. But it really depends, some bettas love large tanks.
Last edited by BakaMandy; 10-19-2009 at 02:06 PM.