I know but it won't work on my tank since the tank is not on a high stand. The way I have it now works for me so I think I'll just keep it that way. Don't want to mess with it. It didn't even work when I had the elbow part on for some odd reason as I set it up exactly like the picture shown. Only difference is that I have the input part next to the output (input located on the opposite side of the powerheads).
(not my drawing; from plantedtank)
. I've actually seen some people who have the Eheim filters at the same height. They say it works so I don't know. Never heard about it not working. The current from the output pushes the loaches when they get near the spray bar.