can't decide on flow/returns

[spikehs]

well, definately not against a closed loop, but i really didn't want to (if possible) of any powerheads in the tank....So i supposed I could have the 2 holes on a closed loop then have the scwd hooked up to the returns....I would really like to have the scwd hooked up to the 2 side holes, but not sure if thats possible if i make that a closded loop.