Closed Loops (New design)

[JDigital]

I'd run the PS3 as your CL pump... drill a 1 or 1.5" hole in the center of the back of the tank, then run whatever size pipe comes off the CL pump all the way back to your returns, which I would make 2 x 3/4", but don't reduce until back at the tank.

I guess it's your choice whether you want to drill for the CL returns, or just run them over the edge of the tank. Then again if its not tempered you could drill those 2 returns through the floor of the tank. I find it really helps in my 75G to suspend detritus as it is an upward flow.