Urchin ID?

[FishyFishy!]

Originally Posted by Skimmer Juice

I have had that urchin for about 8 years now , they are really cool and my bumble bee shrimp hangs out in him . Go get a bumblebee shrimp from oceans so he can have a driver lol

Do they have a symbiotic relationship in the wild? I'll have to look into that. Seems like he'll be hiding in the rock a lot. I added a piece into the frag tank and he went right to it and burrowed