I think that is a marvelous idea, bad thing could be some harmful micro organisms... but you run some risk with live rock too don't you. I have thought about going to some of the local marine parks and getting some sand I just can't figure out which would be really clean. I guess getting it from the mouth of the Capilano when the tide is coming in would be pretty clean water, I wonder about the rock and sand there.... LR??? FREE??... illegal to take though I imagine.
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