Duplex Sump Plan

[snorvich]

After reading the threads about duplex sumps, I am planning on adding a refugium to my current sump as per the drawing below. It will be fed by an Eheim 1250 pump (300 gallons per hour) with a gravity return. Any issues with this plan?

http://reefcentral.com/gallery/data/500/101063Refugium.jpg


Thanks for any comments . . .