Coral

Most of live rock is dead coral skeletons so it will be fine. Make sure you was it good, also from what I have read is alot of dead coral decerations can trap alot of bad things in your tank over time so you might have to clean it on a monthly basis or so.
 
The coral skeletons makes pretty good base rock because it looks natural.But you have to make sure that when you get ready to do a water change,that you take something and blow the detritus out of it.
 
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