I used fake live rock for my display, I have 1 Large piece, did it this way as I wanted to get the height without taking up the whole sandbed & stacking rocks up which were unstable.
Love the pictures in your second post though, will be giving that a go when I upgrade tank size next.

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Red sea max 130D, vortech MP20, lifereef overflow, 70ltr sump/fuge, tunze 9002, Hailea 1/10HP chiller...
My RSM