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Anonymous

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Unless you have a good size refugium attached to your 12G tank this critter will probably starve to death fairly quick. Diadema urchins also grow too large for a 12G tank.
Even with the proper environment, long term success in keeping these is rare.
According to Fishbase: Lives in close association with long-spined sea urchins or branching corals of sheltered reefs. Juvenile fish eat pedicellariae and sphaeridia of the host Diadema and commensal copepods; adult fish eat burrowing bivalves in corals as well as tube feet of their host and eggs of a commercial shrimp.

Regards,
David Mohr
 

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