20g Cork Scape Build

This looks really great, and I'm thinking of adding some in the far left third of my new planted tank. (Shoreslice Method).
 
I was wondering if you filled the holes behind the cork completely with gravel or if you have some other type of filler in the bottom of those spaces and gravel on top?
 
New pictures please? :evil_lol:It looks great. I am thinking of doing this in my 75 gallon. I find I have more trouble getting dimension in my larger tank. I am thinking some cork shelves on the back wall of varied size and shape to create planters might be just what I need to give dimension without giving up to much footprint for the free swimming areas. I have HOB's on my tanks. Do you think this set up will work with HOB without use of a powerhead for circulation. What would you suggest is the best way for me to add shelf/ planters to the back wall without losing too much area at the base of the tank?
 
Fantastic. It looks great. I love the way it looks like a valley in the middle of the cork cliffs. The plants are really making this look like an all natural habitat since they have exploded.
 
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