I am sure it has been asked a lot, and I have read a lot of information. But I figured Bettas were not like Goldfish and just eat and eat and eat.
I read somewhere to feed only as much as the Betta will eat in 2 mins. I also read to only feed once or twice a day. If you feed twice a day do only 4 - 5 pellets.
I am using NLS now, per peoples recommendations here. Was using Aqueon Betta Plus for a few days, but I did not like the inconsistent piece sizes. I gave my Betta 6 pellets of NLS this morning, and he is still acting hungry.