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my sea urchin let all these little grey pebbles around him. I think it might be his excriments, but there is so much of it that it seems unlikely. Does anyone know what they might be?
What kind of info are you looking for?
I've had my urchin for about 2yrs. It was a lr hitchhiker. They are cool. Wait til you see it shoot florescent liquid into the water. LOL Again, perfectly normal according to my experience. I've never had my urchin have any bad effects on my water in anyway.