Feeding Your Betta:
This page is dedicated to feeding your pet bettas. I will discuss live food, frozen food and dry food. I'll be honest and tell which I personally use and which I have no experience using personally, but have read about.
Live foods include: wingless fruit flies(I have never used), pinhead crickets(I have used with my frogs but not with my fish), vinegar eels(I have never used them), microworms(I have fed them to newts but not fish), daphnia(I have never used), brine shrimp(I have used), chopped up red wigglers(I have used), moths(I have used)and white worms(haven't personally used them). I don't mess much with live foods, mostly because not too many are available through my local fish store and I'm a little sketchy about ordering live things over the internet.
Frozen foods include: almost any of the above, plus frozen chicken liver. I have used a lot of frozen foods over the years, currently I only feed frozen brine shrimp and frozen chicken livers, both only occasionally.
Dried foods: These are dried varieties of the above mentioned live and frozen foods, but also include betta pellets(like Betta Bio Gold), dried bloodworms, shrimp, powdered hard-boiled egg yolks, and flake foods. I know a lot of betta breeders advise against feeding bettas flake foods, some even say bettas won't eat them at all, but I have fed flake foods with no problems what-so-ever. Of course I supplement with other foods as well, so flakes aren't the only things my bettas eat, but I still haven't had any problems with flakes.
So, now that I have listed some foods that are available for you to feed your bettas, I will list what I currently feed my bettas. Currently they eat flake foods(both TetraColor and Tetra Tropical Fish Flakes), dried bloodworms, frozen brine shrimp, frozen chicken livers(I puree them in the blender until they are liquidy and then I freeze them in ice cube trays), Betta Bio Gold pellets, hard-boiled egg yolks, the occasional live moth(in the spring and summer)and chopped up red wiggler worms. I also feed Tetra Delica, which are puree'd bloodworms, daphnia and other things that are good for bettas. It's not frozen and comes in little envelopes that you cut open and feed as much of the contents as your fish will eat in about 5 min's, the rest you can refrigerate(something you don't have to do prior to opening)or just toss out. All 3 of my bettas like it, plus my 6 yr. old angelfish likes it.
That's about the extent of my knowledge on food for bettas and I'm always reading more on the care of bettas, so I'm sure I'll have some updates soon.