I want to run an Eheim 1250 as my return pump and hook up my skimmer directly to the overflow. The Eheim 1250 after head pressure matches the rate my skimmer needs and circulation is provided by 2 Tunze Streams so there is no need for a bigger return pump. My only question is my sump also doubles as my refugium (10g section) so there will only be around 200gph through it wich is still 20x but will this be enough flow? Also is a refugium more efficient if my entire tank were to pass through it lets say 10x in one hour or if it passes 1.5x per hour but was provided circulation inside the refugium via a power head?