I think you can get them to spawn with water temp. fluctuations or KCl works too, inject it. I know Martin Moe has done this, and works extensively with Diadema urchins.
Hard. Martin Moe, has been trying to crack Diadema in a big numbers for a few years now. You would have to have seperate larval tanks, and algae cultures. It would be a good idea to invest in a microscope. It can be done, just gotta really want it.
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