plumbing skimmer and sump

My 90 gallon has a 1" overflow and a 3/4 return. Could I use both as overflows or would that be stupid? I was thinking of using a mag 9 for a return pump and splitting to two return nozzles. I am not sure on how to get my octopus recirc. skimmer into the mix either. The center of my sump is set up to be a refugium but I think with that kind of flow I better use the side that the pump is supposed to be in as the refuge and use the center as my area to draw out of for the pump. Anyone have any other thoughts? Or a piping diagram that I might be able to look at

 

um i am not so sure with 2 over flows, i am upgrading to a 90 gallon soon, and for my sump, i am going to use a mag 7, and i might even have to limit the power somewhat, becuase it is prtty strong.

 

You could use the 3/4" line for another OF if you wanted. Just make the standpipe for it and bring your return water over the top edge of the tank.