Did my Cafe-ko die from swim bladder infection? Can I put a another Betta in his old tank?

well i don't think your fish died from a bladder infection. my beta used to be the same way but i just changed his food. and for the swimming oddly, he could have hurt himself. my fish's tail is rather odd because someone put their hand in my tank and touched my fish but he swims fine now. it should be okay to put another fish in the tank.