As far with my experience with these fish, i would use betta pellets (make sure they have great ingredients), freeze dried foods(daphnia, bloodworms, tubifex) as a treat for Bettas. Your fighter shall love having frozen foods because they are high in taste(obviously not for us! Lol) and protein. I dont reccomend live foods as they can carry diseases. I WOULD DEFINITELY NOT USE WORMS! But hey im just giving you tips. Bettas can also be hand fed.