Starfish?

Brittle stars are good. Sand sifters as well but they do not always do well due to the high volume of organic matter needed to sustain them, unless it is a well seasoned or established system. Sea cucumbers do amazingly well in healthy established systems. BUT if something else is out of whack leading to detrital build-up, tossing a sea star in there is probably not going to solve anything.
 
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