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What the heck is this!?

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Hi again all! I've got one question... what the heck is THIS thing? There's a bunch of these little black blotches in my tank.

Thanks in advance, Joe


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Blurry picture, but looks like Asterina Starfish. Mixed opinions out there, generally considered harmless by most, but there are lots of reports of them eating your coralline algae (purple stuff on rocks). I remove them specifically for this reason.

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