I had a small one in a 40 gallon breeder for awhile. The one thing I didn't like about them is that it ate a lot of my purple coralline algae off my rocks. But after I took the urchin out it didn't take long for that to gtow back. Maybe go for a black short spine urchin? I really like the looks of the longspines with the orange eye tho
I always liked the long spine I had one years ago in a twenty nine gallon.i didn't know better then I called him dozer funny how they can sure doze over things.but they do need a lot more room to be happyand yes they eat corolinealgae but they do add character to any tank.