Well I was going to try to build some arches between the extruded part holding my powerhead/filter intake and the chambers holding one of my heaters (all on the left side) with a similar set of arches on the right side connecting the filter output chamber and a chamber in the lower right (potential holder of the large powerhead). And then some larger fallen rocks to build it out in the center. So sorta combining both of them. It's hard to describe.
I see you're from Christiansburg. I was at Va Tech the summer of 2011 for some research in the physics department. It was great. I have applied to tech for grad school.