Hey, Fishfirst, I've found that Banggais don't really need urchins to spawn and protect their young, and I've also found that the urchins aren't really all that much protection anyway. Banggais are lagoon fish which normally don't have to contend with reef fish poking around them, and while the longspine Diadema urchind they like are usful in the laggons, they aren't much help against many reef fish.
I guess what I'm saying is that while the urchins would be a nice luxury, a luxury is what they are. If you want to breed Banggais, just put them in their own tank with lots of cover, preferably longspine urchins if you can get them, but anything they can hide in will make them comfy.
Oh, and unless your pair likes each other, you'll want to get a few more more for a little group of six or so. This will let them pair off like they do, although the poor guy at the bottom of the pecking order will need your attention and extra feeding.
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