Ok. Thank you, but i have an extension that brings the intake all the way to the bottom of the tank. Does that make it much more efficient?
It's actually probably more efficient than most set-ups then.
I have a 100gph HOB on my 10 gallon (10:1 ratio), and a 150gph HOB on my 20 gallon (7.5:1 ratio). but only a 165gph CANISTER on my 75 gallon, that's only a 2.15:1 ratio.