Don't! I have a tuxedo urchin and have given up and put him in my sump where he is still a problem. I have read many stories on them and almost everyone with a reef tank either pops them or donates them and regrets purchasing it. My tuxedo urchin (~10cm diameter excluding spines) grabs anything that is the size of a small sps colony and drags it with him. Bigger stuff just gets tossed on the bottom when he can't hold on. Assuming you overcome this issue, the feces produce substantial nutrient cycling and detritus, contributing to algae issues. I got mine because I am actually an urchin biologist, but will give him away at my first chance. I have had him for about five years now. Perhaps other species or smaller ones are not as problematic, but based on stories from many others, I would bet not. Just my $0.02.
Dan
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