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Old 09-27-2009, 05:27 PM   #1
Eazy222
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What about Urchins

While looking for more hitchhikers on my live rock I found what looks to be an Urchin. Small about the size of a dime and little black spikes all over it. Are the bad for the tank?
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Old 09-27-2009, 06:28 PM   #2
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Nope just bad for your coraline alge.
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Old 09-28-2009, 11:40 PM   #3
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Actually, not an issue for the coraline, as they will graze the rock for algae 9leaving bare rock) where coralline can then grow.
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Old 09-29-2009, 06:59 AM   #4
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Old 10-03-2009, 12:47 AM   #5
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They ingest coraline and expel tiny spores of coraline that will settle all over the tank helping to spread it around quicker as well.

The black short spine urchin is a common liverock hitchiker.
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