Is this a bad cobination?

[StephenHV]

Sea urchin with an Ann.--afraid the urchin's spines may hurt the an. any info?

[marc price]

maybe, depends on the species of both animals. i once watched my H. crispa eat a resident rock urchin.

[Toddrtrex]

I would be more worried for the urchin -- depending on the anemone. I have watched my S. Haddonis eat a their fair share over the years, no issues for the anemones.