Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
I tried something similar, though for a different reason.
I tried to make a sand area in front of some rocks, Soil Master Select (similar to Turface) in the back, above the rocks for planting.
The sand and SMS mixed, sort of. The sand kept working its way between the rocks, mostly sifting along the bottom of the tank, and the SMS kept rising.
Net result: The sand has migrated from the front 1/4 of the tank almost all the way to the back, making a blended sheet of SMS + sand across the bottom of the tank. The SMS has drifted over the rocks into the 'sand' area. Yes, I can put the SMS back where it belongs, but not the sand.
What I think will happen:
At first you will have a layered effect: Turface under, sand on top.
Then the sand will start working its way through the Turface. I think this is what you are hoping for. So far, so good.
But the sand will keep moving. On down until it hits the bottom of the tank, and will then start moving out of the carpet area, until it will be a sort of bottom layer, sand + Turface all over the tank.
This will not happen right away, my tank has been set up about 2+ years.