Jakes look down cube build

[Borderjumper]

You will need to play with your over the tank return idea. The top of the water surface needs to be as still as possible in a look down tank. Thats why the one I'm putting together has the waterfall and return holes near the bottom of the tank. it wouldn't be hard to make a taller overflow box and use it as a return.
You need to come and look at this one for ideas.
S