Zach B
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My Tank Thread
I didn't know they ate coralline, whoops. I've had a black spine urchin for a couple years and never noticed it. I do however need to get rid of it soon as it has grown quite large for my tankI Love Love Love urchins too. Such cool creatures. But they will eat your coralline algae too. I had to put mine in the sump until my tank gets more coralline growing in it.