My pencil urchin eats the coraline algea righ off y rock. i have 2 pieces that are
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because he ate all of the algea off of it. It makes a big mess when they eat corline algea. The leave pieces of it chewed up, along with there poop, all over the rocks. He does the job, and he only cost $5.00. Good investment if you want to get rid or the coraline.
Leopard