My C.o. larvae seem to have become interested in bigger and better things than daphnia, like each other. They're even going for newtlets the same size and age as them! I think all the weaklings have been killed off since it's been a while since the last death, but one of the survivors is missing a forearm. I've calculated that the blood worms at the store near me are the same size proportionately to the larvae as the earth worms I feed their parents. I was just wondering if larvae could handle the small struggle that the adults have swallowing the earthworms. I would only offer the blood worm as an occasional supplement to a still primarily daphnia diet.