I fed my bettas between 2 - 4 bloodworms per day, depending on the size of the worms and size of the betta (2 for small female, 4 for large male). I fed 2 or 3 pellets in the a.m. and the worms at night.

Bettas are totally carnivorous, so shouldn't be fed flakes. You can add some frozen brine shrimp to the diet. My bettas weren't wild about them, but it's good to have variety.