04-15-2014, 08:48 AM
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not an expert, ... i think the only 'dead spots' you'll find are in areas under the substrate.
water flow, even without current caused by a filter, fish movement should ensure water does not get stagnent even in the most remote bottom corners of a square tank. water diffusion could also ensure nothing goes stagenent in the tank.
instead of a submerged box, you could use hoses & fittings to put the input end anywhere in the tank you want.
whole different idea,
myself, just a bubble want on one wall of the tank, the drag from the bubbles pulls water with it up, to the surface. creating a pull of water along the bottom by the bubble wand, creates a gentle flow of water across the tank (if the wand is as long as the wall it's placed by)
not saying to use this, ... just mentioning it doesn't take much to get water going to ensure there are no 'dead zones'