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im setting up a new 30g system, and i just ordered 25lbs of Marco rock. its very nice base rock that is just dead "live rock." you can seed it with live rock and once it becomes covered in coralline and other life it looks the best IMO. there are some people around here that use marco rock exclusively in their tanks. just do a search for "marco rock" and you should find some. it is cheap too.
personally, i would get some marco rock and cook it for a while in a large trashcan or tote, and seed it with your live rock when you transfer it over to your 75g. it would look boss.
HTH
-kyle
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-Lewis
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