I have 2 Eheim 2217's on my 55 and what I did was place the spray bars on the back wall facing toward the front of the aquarium angled up slightly for water agitation with the intakes on each corner of the tank with my heater in the middle of the 2 spraybars.
Has worked beautiful for me
I have good water flow throughout the entire tank, the flow goes from the back to the front of the aquarium then swirls clockwise/counter clockwise in the middle and back again. About the fish, once you do this set-up they will have to get used to the currents in the tank, after they get used to it, no problem. My fish swim mid/Low tho... Once i get my blue flash cyps (Swim at the top of the tank) i'll let you know.
Look @ my current set-up pics for today on my profile and you will see how I placed my spraybars.
Has worked beautiful for me
Look @ my current set-up pics for today on my profile and you will see how I placed my spraybars.