After having the bottom crack on a tank I opted for egg crate. It just made me feel a little safer. I put 3-4 inches of course sandon top and never had any problems with sand blowing around.
I'm dis illusioned with sand tho. I had the deep sand bed go bad in my RSM a month ago and it was a mess tearing the whole tank down and rebuilding it.
I have some days off.. So I'm siphoning the sand out of the bigger tank a small section a night and replacing it with a a single layer of crushed coral. I find I can clean the bottom with the crushed coral by just moving it around with the suction hose. Granted I can't get all the sand under the rocks but I'm getting most of it.
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"Rules are for the obedience of fools and the guidance of wise men."
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