plumbing /gravity feed question???

[jwccwj]

Hi,Im new to the reefing scence and Im planning my future tank.I was just wondering that if I had a 180g tank with a long(coast to coast external overflow box) that had four 1 inch bulkheads two of which were being used as drains(other two as returns) and I wanted to gravity feed a Deltec ap702 skimmer which I believe has a recommended feed rate of 600gph of water ,where should I direct the second 1 inch drain if the skimmer only requires one of the drains to feed it.I will have a sump with a refugium so should I direct the second drain to the refugium or into the skimmer compartment?Im planning on having a three compartment sump with the first compartment holding the gravity fed skimmer the second compartment as a return area a the third compartment as a refugium.Hope this isnt to confusing,thanks.

 

[bertoni]

I'd likely just dump the drain line into the skimmer area, since that will likely already have a bubble trap. Other than that, either approach will work.