Stickboy15
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so I got a urchin and started getting this white stuff on my rocks after?
What is this on my rock
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Scottyxcameron
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What kind of urchin? It could be from it eating the algae!
Leslie Tabor
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It is the tracks the urchin leaves as it scratches algae off the rocks. You also have an asterina star fish there. 
OP
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Stickboy15
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its a white pin cushion
