Greetings all,I am in the planning stage of a closed loop manifold system in my 125 reef.I have a RIO 2500 that I would like to use in my sump.My sump currently has a Mag 7 for a return to the main tank.At a 4ft head this is in the neighborhood of 500 gallons per hr. My overflow feed line to the sump is 1.25 inches.If I add the RIO to the sump I am looking at around 600 additional gallons per hour from the sump to the tank.This would be 1100 gallons per hour.the question is will my siphon overflow handle this much flow at 1.25 iches.would love to hear if anyone has ever tried or done such a thing, or any suggestions to make this work. many thanks MJG426