Join Date: Sep 2011
Location: Glenn Heights, TX
If your entire substrate is sand it can be as deep as you want it to achieve the desired scape but you will need to invest in a bunch of root tabs for the set up and add more periodically after the tank has been up and running.
If you are using the sand as a cap over something like MTS od MGOPM you should be fine with 1.5" or so.
Born to fish, forced to work, but only have time for work, family, and my aquarium.