Yesterday I got some frozen bloodworms, since I heard frozen bloodworms are pretty good for bettas and they LOVE them. Today, I gave each of my bettas (I have 2) a little chunk of frozen bloodworms, and they both ignored it. My one betta obviously saw them, and just swam away from them. He went over to investigate them but didn't eat them. My other betta might not have seen them, because I have to open his tank lid to feed him, and he hates it when I open the tank lid. I rcently got them from a pet store, so I wasn't sure if maybe they hadn't seen them before or something? I just thought bettas loved them. It's definately not a problem, just curious as to why they may not have eaten them.