Bill, I used silicone & 2mm sizes aragonite on a sheet of plexi-glass that fit into my 90g cube. I still have pics if your interested by the way. It looked good at first but I would also not do it again.
Even the small layer of gravel trapped detritus, but most of all, made it harder to siphon clean. I prefer just bare glass now or starboard of some type. I also have some pics of a seasoned bare bottomed tank with great looking coralline growing on it. It seems to be the first place its growing in my new 45 cube also.
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Doug
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