I am thinking about plumbing a UV with no sump. The UV would be a 40 watt Emperor Aquatics. If I used a overflow box for gravity to feed the intake into the UV and then used a return pump from the UV back to the aquarium will this work ? Off corse I would put true union valves on each side. This is a 180 build using 2 Eheim canister filters. I really don't want to cut the return of a Eheim and place the UV inline because there would be no flow control. I don't want to put a valve on a Eheim to turn down flow. Any thoughts on this would be appreciated.