Yep... Used to have the same problem with newly bought fellas.... Until I started feeding them guppy pellets... Now they eat them like nobody's business... Heheh...

If you want to get a betta excited on eating whatever that is dunked into its tank, you should feed it live feed first... My DDR crown refused to eat anything I gave, and only ate one or two pellets a day till I filled his tank with live daphnia. After sampling the live feed, he's now game for anything I throw in.

Treat bettas like as if they are children. If they refuse to eat, it may be because they find the food boring, so change the food. Or it could be because they are sick. Be alert to the situation.