2 mp40s will work nicely and you won't have to have them maxed out to get decent flow I have 3 but I'm only using one right now because there so loud, like a whining sound so I'm waiting till I do the QD upgrade
I have mine in a corner so both are off set one on each side of the over flow about 7 or 8 inches below the surface, they would probably work best if they were offset across from each other but I'd rather not have them out in the open if that makes sense
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