Right now it is going from the sump to the uv and back to the tank on the right side(from the back)I will take your advise and change it around when I get a chance...but for now my water is crystal clear,NICE:tub:nice work, I have one comment is your UV light output going back into your display? If so I would pipe it back in the sump next to your skimmer so it would remove the dead bugies.