If you want to go bare bottom another option is to use "Starboard" aka HDPE plastic aka cutting board material. Most plastic/acrylic shops carry it and it's not expensive. You can order it in 1/4" or 1/2". It floats and silicone won't stick to it well enough to hold it down, so you have to put rock on top to hold it down. Looks great. Do some Google Image searching for "HDPE BB reef".
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~ Mindy
SPS fanatic.
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