Small white starfish

Jan 16, 2004
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Minnesota
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#1
Does anyone have or had an issue with those little white and gray "starfish" looking things. I pull 20 to 50 a week out of my tank. Seems if I leave them alone they will over take the tank. They like to eat the coraline algee. I see white spots every where they have been. A Harlequin Shrimp is not an option, as I have other star fish in the tank. any suggestions?