A question about closed loops

[Skimmerking]

I'm upgrading to a 170 i know its not the 180 club ,but with the sump it will be 210.

The question that i have is I'm getting a tank that is 60x27x24 with 2x overflows to run 1.5" pipes. Now the return pump i'm going to use is a Barracuda 4500GPh or should i use my 3MD as the return and keep the barracuda as a close loop.

Or should i use the barracuda as a return and have it teed off to the 32"beckett skimmer. I know that the pump is a direct drive and its not a pressure pump.

Is there any otherways that i could run this i also thought about running the cuda on a CL with the input pipe going into the overflow and having 4 1" pipes spaced around the top of the tank.

THere is another question can i have smaller returns on the Barracuda pump instead of a 1.5" return have 1" returns or is this a NO NO with this type ofg pump...


what about this

http://www.gilandbri.com/html/aquascaped__1.html

a guy on reef central shown me this on his tank...