Live rock on eggcrate, sand or on bottom?

[cale262]

I’ve put the eggcrate down in my tanks with deeper substrate/sand. I'd like to have the BB benefits in my next build but don’t like the look and reflection of a glass bottoms. I’ve also read a few threads were people either come home to or wake up to a flood resulting from a cracked bottom glass (albeit few and far between)…So to err on the side of caution and for esthetic reasons, I am likely to place a black piece of acrylic siliconed to the bottom of the tank which will eventually be covered in coralline…it may just be me, but for some reason I find the coralline grows faster on the acrylic than the glass.