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dendro--
From what I've read, most coral larvae will not settle on sterile anything. Oftentimes, they will come down and "taste" the substrate looking for some sort of chemical cues. Some it's a (low) growth of algae, some it's coralline.
But, I think that you are certainly correct about conditioning your corals the way the fish breeders condition their broodstock. If there's barely energy to survive there won't be energy for reproduction.
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--Andy
"And chase the frothy bubbles, / While the world is full of troubles. . . ." --W. B. Yeats
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