Cories love their worms. I was feeding live blood worms but I found I was getting lots of parasites out of them. Frozen does the trick. After stuffing the worms for a week do a huge water change with straight cold water. Of they're going to spawn it will happen then. I've got 9 pepper cory babies from my last spawn in my community tank. Triggered it accidentally, but I've got two friends who sell on aquabid and that's how they get theirs to spawn.