Wow, quite surprised how many use eggcrate.
I myself use fine araganite, and then placed my rock on it... When creating my landscape I would work/wiggle the base/bottom rocks into the sand so the were basically at the glass bottom, and then the sand is all around the base.
Nice thing with this is that I can syphon my sand, of which I have been doing for about 6-8 months now, since I was having coral issues.
And I guess like others stated, I can go bare bottom if I wish. I won't, but I have that choice.
I guess if you are concerned about falling rock, breaking your bottom pane of your tank, then it would be a matter of making sure everything is secure.
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Setup: 180G DT, 105G Refuge (approx. 300lbs LR, 150lbs Aragonite)
Hardware: Super Reef Octopus SSS-3000, Tunze ATO, Mag 18 return, 2x MP40W, 2X Koralia 4's Wavemaker
Lighting: 5ft Hamilton Belize Sun (2x250W MH, 2X80W T5HO)
Type of Aquarium: mixed reef (SPS & LPS) with fish
Dosing: Mg, Ca, Alk
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