you are absolutely correct on that i tried to create a center for both tanks just dont really like the way it looks. maybe i need to come up with a new design for the home made center brace for both tanks....
I've seen folks that used epoxy and polycarbonate rods to make dividers/spreaders in tanks. You could put in two pieces across the short dimension of the tank, then epoxy a flat plate of plexi on top to act as the ledge for the glass top.
Search the forum for threads by Toddnbecka (I think that's the right name). He used to be more active on the forum, and I am pretty sure he was the one who was making the center braces for his tanks.