he's a pretty lil ninja dude!
another type of food that you might want to try is frozen. bloodworms, mysis shrimp, brine shrimp, etc. my betta pretty much eats whatever the other fish in my other tanks eat, but in much smaller quantities. i've never had a betta turn his nose up at frozen bloodworms!
a note on the special betta water conditioner/dechlorinator: SALES GIMMICK! seriously, the betta dechlor is simply regular dechlor watered down. so you end up using more of it and buying more of it more often. get a bottle of Prime or Aquaplus instead! (if your tap water has chloramine then you want Prime, if it is just chlorine then you can use Aquaplus).