I've considered one because I have a ton of astrea and they do wipe out cotaline. They look identical to my sand sifter and though at first they would get bigger and I'd sell or give them away. I've changed my mind some one because I think it will run out of food quick and two they don't eat the whole star fish just the soft feet and would be left with a lot of dead bodies in my tank for bristle worms to bleak up
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