I have a purple pincushion urchin and never have had any issues. He doesn’t even move the frags on the sand. From what I was told the tuxedos pick up more. They will eat all of your coraline algae though.
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“In wine there is wisdom; in beer there is freedom, in water there is bacteria.” - Benjamin Franklin
Current Tank Info: 90 gallon reef. Biocube 29 lionfish tank. Mantis tank.
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