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I don't think a true BA can be done across dual overflows - at least, I couldn't figure out how to do it! In my case, I don't see any good reason to run anywhere close to 2600 gph through my sump - my guess is I'm less then half of that, probably 1000 or so. So, half runs through the durso into an ATS (so water-air mixture is actually preferred); the other half through the siphon quietly into the skimmer section of the sump. Should either the durso or the siphon become fully plugged, the emergency will manage the load. should both become fully plugged ...... well, hopefully that won't happen.
I think, in retrospect, I ought to have bought a non reef ready version of the tank and installed my own C2C overflow with external BA - too late now though.
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