Excuse the shoddy photo but I only had my phone with me. I popped into the lfs at lunch time knowing that he'd just visited tmc yesterday and I was after some cerith snails. He'd sent the ceriths to the other store and kept these which where labelled "Bumble Bee". When he looked them up though they didn't appear to look like the bumble bee snails in the book. Bumble bee snails in the book where labeled as preditory, eating other snails and all sorts of reef critters and worms and generally reef unsafe.
i think there just writning for safety, mainly due to the fact that if there not enough food critters will go find theyre own source of food, just like crabs really as long as theyre is food theyll be fine.