I'm curious to know what you put in your pepper grinder that your bettas love. I have a fussy betta who seems to only eat frozen food - i.e. not flake. I have tried bettamin but he's not fussed with that either.
I feed mine a variety of (but not all each feeding): frozen brine shrimp, frozen blood worms, frozen tropical tucker, flakes, dried tubiflex worms, crisps, pellets (though none seem to like it), wafers, cucumber and lettuce.
I want to try live food and will buy a culture of microworms. I have tried throwing insects from the garden into the tank but the fish ignore them.
I feed my fish once a day.
It's really interesting to see the range of feedings for everyone.
Actually, one fish shop told me it's the number one cause of sick fish that come in to them - people simply don't feed them enough, or don't feed enough at feeding times.