01-12-2012, 10:56 PM
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Home depot play sand. You could mix it in, but at that point, I would just get plants that are okay with out nutrients in the substrate. What you could do is do a base layer of say flourite and then sand. 40pounds of flourite and then 60 or so of sand. Also you could just dose nutrients through the water, which some plants like and some don't. Plant fertilizer is very cheap.