Urchin expelling black stuff

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carpetlover

carpetlover

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My tux seems happy as he is carrying macro algae on his back, but he is excreting black poop like things everywhere he goes. I heard that their poop is sand like, so I have no idea what it is. Can anyone help?
Pics: my urchin, then his black excrement

8F07CA05-4A7B-4749-AEDC-84C806AC2775.jpeg 54F5CCC5-CD80-4F0F-AC95-B1E6F63FA075.jpeg
 
IMHO, if it seems to be doing OK, I wouldn't worry too much. Besides, what would you do if it was a sign of being in poor health?
 

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