I don't think it matters to the coral if you place it in the sand or in the rocks.If it was me ,I would place it in the rocks and use gel glue to fasten it down,I think it would keep falling over in the sand.I think with 260w of light,the middle 1/3 of the tank would be about right for a moderate light coral.This is all just a guess and I'm baseing it on my hammer and torch coral needs.
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