Very happy about the flow in my tank so far, albeit empty with no rock in the way. Adding floating flake food to the water 95% of it flows over the weir in 20 seconds or less. Sinking pellets never really settle on the bottom and keep circulating in the water until they eventually go over the weir, the pellets that do hit the bottom eventually get picked back up into the water column. I have the circulation in the tank flowing like the water in a front loading washing machine would spin. Thanks again goes to Mr. Wilson for his help and tech on my flow design.