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Thanks, I was thinking more of the ones without a downside rather than bristleworms lol!Some stomatella and collonista snails, micro brittle starfish, some species of Nassarius and other snails (turbo snail, trochus, etc.), if you count Aquilonastra ("Asterina") starfish they do too.
To my knowledge, most of these can be hit or miss on reproducing in a tank though.
Edit: Knew I forgot one - bristleworms typically reproduce just fine too.