Actually, it's simplicity itself.
Proper manipulation of the moonlighting and temperature will make them spawn, or if you want instant results, just inject them, in the soft spot around their mouths, with a KCL solution. They'll spawn like crazy within hours, or even minutes if they're already ripe. It's a common lab procedure, since urchin larvae are very useful in bioassay testing. ( for toxicity in a system, for example )
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