I had a NC12 original setup as a hospital tank with a maxijet 900, which gives you a max. flow rate 230 GPH. Considering the headloss, the 900 can pump approx. about 110 GPH of water in a 12 inch vertical climb.
I had good results with this pump, and it worked out really well IMO. Also the Maxijet 900 is definitely more energy efficient and puts out less heat than the 1200.
Here are the specs for the Maxijet 900 and 1200
Maxijet 900
Wattage: 8.5W
Max Flow: 230gph
Dimensions: 3.5" L x 2" W x 3.25" H
Considering the headloss of one feet vertically, the maxijet 900 will give you a flow rate of approx. 110 GPH
Maxijet 1200
Wattage: 20W
Max Flow: 295gph
Dimensions: 3.5" L x 2" W x 3.25" H
Considering the headloss of one feet vertically, the maxijet 1200 will give you a flow rate of approx. 190 GPH
Take a quick look at this thread...
I posted some infomation about these pumps and their flow rates.
http://www.nanotank.com/forum/viewtopic ... sc&start=0