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What's my Cantharus cancellarius eating?

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  • What's my Cantharus cancellarius eating?

    Sorry for posting so much today.

    I have several Cantharus cancellarius that hitchhiked in on my live rock. I read that they prey on other snails. I can confirm this as I watched one try to kill a limpet that managed to outrun the killer whelk.

    However, none of my Astrea snails nor my Turbo have disappeared or been harmed. I've had to get the limpets out of the tank myself, too, so the whelks haven't killed any of the large limpets as I would have liked.

    So my question is, if these guys aren't eating my other snails, what are they eating? Does anyone know anything else about this species?