Tuxedo - no. Is a pin cushion urchin the long spined urchin, Diadema? IME, small-to-medium Diadema does not graze Caulerpa. Small rock-boring urchin Echinometra also does not preferentially graze Caulerpa, in my limited experience with that genus.
This thread deals with the subject. Some sea slugs are specialized to graze on siphonous algae like Caulerpa. I don't have any successful experience with them, though.
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