I'm not planning on using only live rock.. but now I know I don't have to go spending thousands of dollars for live rock to get my tank up and going.
I do have a 3 inch sand bed already.
As far as pesticides.. she digs the stuff up from ranch land she has access to, and I know she doesn't fertilize.. Besides I have had 5 pieces in my tank from her for the past 6 months, I'm not too worried about pesticides. Thanks for looking out though.