Tuxedo Urchin is AWOL!! Maybe he jumped the fence.

Bought a tuxedo urchin last week. He moved around the tank for a few days on the glass and the rockwork... then he disappeared. I haven't seen him in three days. Looked everywhere I can see. I have a backing on my tank and I didn't move the rocks, but I figured he'd move into someplace I could see him after a few days.
Is this normal?
Thanx,
Red
 
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