The bigger they are, I find, the more settled they are in their habitat. I've seen large colonies moved a few inches in a tank RTN overnight. Larger pieces have more O2 demands, and once anything at all goes wrong in the bag, it escalates quickly. Not saying you can't ship bigger pieces, but they are less tolerant. For a large center piece, you'd be better off finding something local that would be easy to move.
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Brad
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