If you Decide to make your system with the Amp to be your return you definelty must make several Baffels and 2 overflows then.
If you didnt buy your mag 7 yet I would get a larger model T it off with valves and supply your tank and Fuge with one return pump,and place the Amp on a closed loop. 
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RobinL
Set Up:
125 Gallon Reef /90 g sump /Ecosystem Refugium 30Gal,SPS,LPS,softy`s, Equipment:2 x 250w 10K XM DE MH,4x 46\" T5 actinics ,CanFoamer830(AeroFoamer Knock Off),Reef Rat,GEO Calcium Reactor,Kalk Reactor,PC Chiller1/4 hp, and more..
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