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			 not sure if they are symbiotic but my shrimp is always riding on the urchin .  
		
	
		
		
		
		
			Also my urchin goes literally everywhere he is visible quit often even though they do borough . Don't really have issues with it knocking stuff over which is nice 
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	stuff happens when you go outside Im a hustler / I'll hop in the ocean / sell a whale a splash  | 
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			 ive kept a rock boring urchin in my overflow for about going on 3 yrs now lol he lives in a 8 x 6 x 12 box ,  there's nothing in there but coraline for him to eat  and i dont feed the urchin anything and often forget hes in there for months on end just to keep finding him alive and bigger than before lol i use to pick him out of there but he kept insisting on going back so stay there he did  
		
	
		
		
		
		
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