I'd be concerned about bacteria present in them. I'd also say it would be better to use frozen or freeze dried bloodworms. I'm no expert either but the earthworm digests things and passes them out the backside and some of those materials may still be present.....Plus all of the other unseen things like the bacteria. Too much of a chance with our beloved friends.I cut up some earth worms and cleaned them out. I was wondering if I could feed to bettas?