ciculation question

[martym]

Ok, 75g tank, with 20g sump. I have a mag7 for return,2 802 ph, 2 Mj900ph, and a natural wave contoller for the 2 mj's and 1 802. I'm not happy with the circulation. Should I add more Ph's? or I was thinking of 2 seperate closed loops powered by 2 mag9'sor 12's. I would have several outputs for the closed loops so I could control dead zones. Which would be better, or is there something else out there?