OK, my camera is not working at the moment, but here is a better description to go with the "illustration".
Tank is 60x18x18
Main filter is Fluval 403
I put the extra powerhead on to try and get better circulation around the rock piles. Am not at home right now, but the powerhead isn't particularly strong.
The intake for the 403 is 2" from the substrate and the exit is about 3" from the surface, pointing up slightly to agitate the surface.