Has anyone actually heard of rock falling and breaking a tank bottom? I wouldn't think it likely, they fall in slow motion in the water... but you never know. I think a piece of 1/8" Plexiglas would be better than egg crate if you're worried about your glass.
I would still raise the back of your rock up on stilts to get flow across the bottom of your rock. Any rock surface buried in sand is wasted. Leave the door open to go bare bottom if you find your nutrient levels aren't where you want them.
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