Paul thanks for the detailed response. To quickly clear a few things up...the room is only 12 feet across and I don't really want to rotate the tank.
The rockwork will be well away from both the front pane and the rear pane. I don't like rock touching the back wall (or even being close to it). Easy access means I can get in to scrape it clean. I'm going to paint both side and rear panes so you are free to put holes wherever you wish there.
The overflow box in the model is only 12" high. I don't imagine I need to make it narrower to incorporate outlets that flank it higher up as that will flow against the returns.
The tidal thing just sounds neat but really I just want my flow to be hidden as well as possible and to be a bit random with one of your units. Random or at least varied as with the tidal thing.
Thanks!
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