Mix Bettamin with New Life Spectrum betta food. Floaties + sinkies. Just be careful not to overfeed - the little NLS pellets are half the size of Bettamin, and two or three Bettamin are about right for a meal.
Why not get some shrimp? You'll need a heap of moss or susswassertang for the tank floor, but all my fish have their own little tank buddies/mobile snacks -- I keep finding them long after I thought they'd eaten the last one. Shrimp learn to hide, and can do so very effectively, apparently.
Then the shrimp food won't go to waste. :D