I recently started a new tank with all dry rock. I let it cycle for a good couple months before anything went into it and I have no problems with it at all. I would suggest looking at a few LFS's and just pick out a few prices that catch your eye from each. I bought all of mine from one place to get a bit of a discount but looking back I would pay a little more for some variety. Its also cheaper then paying the shipping got all mine for $2.50 a lb.
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