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ASTERINA STARSYou may see little oddly shaped white starfish crawling around on your glass. These are asterina stars. They will split and multiply in your tank. MOST asterinas in our tanks are good guys, but there are some types that munch on coral. Watch them... if they are always on your coral, be wary. If they are cruising your glass, they are probably algae grazers. Here's the FAQ.