Thanks for the advice, I was leaning towards the 16" depth myself. It is soooo hard to force myself to plan and not be impulsive.

Another Question: I am planning on using a Mag 7 or 9.5 from my sump and plumb it through a SCWD and from the SCWD into 4 Loc-Lines (2 for each SCWD outlet) so I can fine tune the flow in my tank. Sound like a good plan?