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Thought I'd save you the trouble, unless you already found it. Here's the link to the river manifold design. Looks easy enough to make. River-Tank Manifold Design — Loaches Online
Very nice. Thanks, that does look pretty simple, one could reduce the directional flow by adding one of the hydor mod kits - although that may redirect the flow too much. Hhhhhmmmm . . . off to ponder.