Ideally for a SPS tank, BB is best, but I also really wanted more of an overall reef display, so i used about an inch of sand. It's completely blown out around the front, and the back areas are good, but covered in broken frags, snail shells, etc, that I can't reach, and it kinda looks like crap. Not sure I wouldn't do it again, but I used eggcrate under everything and can't siphon it out now.
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Brad
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