Play sand, thin layer?
I am going to rescape my heavily planted low tech 29 g tank. The major change would be using play sand as the substrate for mainly decoration purposes (I currently have fluorite black substrate). Then grow plants such as anubias, java fern, etc, that don't need to root into the substrate to grow (I will attach them to woods and rocks). Since the sand is only decorative, I wonder if I could do away with a thin layer, for the ease of maintenance. I am thinking maybe 0.5 inch for the ease of vacuum cleaning and then no churning needed at all. I have no experience with sand, so what do you guys think?
Edit: I forgot to mention that I also plan to grow duckweed on the water surface.