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or you could put the large borader rock on the sand and not worry about it. it is not likely that anything we keep in our tanks will burrow enuf to tople rocks if ou put large ones on the bottom.
Steve
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Well, that isnt exactly true =). I have an adult pistol shrimp who has decided that his home was going to be under my 50#+ boulder. He has made a bunch of tunnels under there and now the boulder does have sections touching the glass. I'm not worried about it because there are no other rocks on top of it that can fall.