hey, I've been doing some research on green sand, I wonder if one of the nurseries around carry it, its very cheep stuff. You should have some fun with the soil mixes, I know ive tried about 10 different ones, but always came back to the Guano/castings/shrimp compost/lime/mycorise water let it sit for a couple days and mix it up every couple days. I think liquid karma will get added to the mix next time..