I own a stainless steel inflow that I used to use on my 40 breeder attached to a 525 gallon/hour canister filter. At that speed it worked fine so long as the intake slits remained clean. If a few big plant leaves fell across them and clogged them then I would get the suckage you mention with the skimmer. I am planning to use this on my 75 gallon fx4 when it arrives. My solution going forward was to use my drill press to drill 4 holes in the screw on cap at the base of the lily pipe to add additional inflow potential. Will it work? Not sure but I'm hopeful.