i would seriously reconsider using a mag 36. (man i feel like the electric police) A mag 36 uses 365 watts and only provides like 3600gph. a dart uses 165 watts and outputs are similar, if you have a lot of head id look into another type of pump but mags are inefficent over like a model 9.5 ish. mdm makes a pump smaller than the dart 2500 gph and it uses 96 watts. with big reefs its easy to get caught up in this and that and then after its all done you got a huge electric bill, and no money left to pay it.
good luck on your setup