Adding rock to cycled tank

[Nano]

I wanted to change up the layout of my tank, so I have thought of taking some LR out of the DT, and putting it in the sump cause its not working for coral placement, so is it ok to do this and add some dry, base, or LR to the DT in its place? I'm looking for more shelf space so to speak. It wouldn't be much, maybe 5-10lbs at most.

Btw anyone have any shelf pieces they wanna get rid of