Urchin for a 20g?

herostar

Active member
I've got a 20H tank that's a mixed reef w/ 2 clownfish in it. I want to add an urchin, but am worried about them getting too big for my tank. Is there an urchin that is reef safe and stays rather small? (2")
 
not going to really work i have tried. usually in a tank that small your rock is small so they can push alot of stuff around. the second thing is the percentage of it climbing and rubbing against your corals goes up because the tank is so small. i had a pincushion in my 29g and it just didnt work, they are cool but its not worth the trouble
 
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