Travis, thanks for that good info. I would like to try out using about 1/4 inch of yard soil mixed with a bit of peat and then top that off with my normal substrate (SMS-type stuff).
My only problem is that I'll have to commit to an aquascape without pulling up plants and moving them around, otherwise, I'll have a mess on my hands when the soil gets into the water column.
-Dave
How much $$ would I have to spend on aquasoil for a 48" x 12" footprint if I decided last minute to go with that? Now I'm VERY curious.