As a sump return you don't need to have the 10x tank capacity. In your tank you should have at least 10x the capacity for flow but a lot of your flow needs are determined by the coral that you keep. In my old 90 gallon I had in the area of 3000GPH flow but a lot of that was behind rocks and in tank plumbing. Having say a Mag9 would be overkill in my opinion. Yes you'd have tons of water movement but in my opinion you'd have to much water flowing through the sump. Granted the MJ1200 is a bit on the small side for your needs I'd say your sump flow should be fairly limited but again that is determined by what you are using the sump for. If you intend for it to house heaters, filtration, DSB, Macro algaes then you'll want a slower water flow but if you just want it as a holding tank to aerate your water then you'd want a lot more water flow.
For my 60 gallon I'm using a Mag5 return but my sump is going to contain my skimmer, a coil denitrator a Kalk reactor, auto (gravity fed) FW top off and probably a refugium with a DSB and Macro Algaes. My sump is a 20 gallon long and my refugium which is seperate is about 15 gallons but the refugium will be fed by a small Rio from the sump.
Doug
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