I'm in the NWSubs.
I build my MTS from HomeDepot Topsoil 40#s @ $1.17.
Here's a link to a Tank I build using Dirt from my Yard (and a few other things...LOL). http://www.plantedtank.net/forums/sh...d.php?t=154884
I'm not suggesting you follow the Recipe I used in that tank. Just offered to show it can be done successfully.
If you are planning on growing plants that love Fe, Red Clay will help. I'm a big fan of Crypt sp. and that has helped me.
I have extra Powdered Red art Clay and some Muriate of Potash if you what/need some. Pm me If i can help.