What size of holes do have for your drain? Generally speaking the bulk head size will be 3/4" smaller than the diameter of the hole you have.This will be the limiting factor for how much water you need to return to the display. Reef central has a head loss calculator you can use to help you figure out what the flow will be with all your plumbing after you decide on a pump.
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260g mixed reef, 105g sump, water blaster 7000 return, Bubble King SM 300 skimmer, Aqua Controller Jr, 4 radions, 3 Tunze 6055s,1 tunze 6065, 2 Vortech MP40s, Vortech MP20, Tunze ATO, GHL SA2 doser, 2 TLF reactors (1 carbon, 1 rowa). http://www.canreef.com/vbulletin/showthread.php?t=50034 . Tank Video here http://www.vimeo.com/2304609 and here http://www.vimeo.com/16591694
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