I know next to nothing and I'm running a 125. I was running a 5, 75, and 125 simultaneously but I finally tore down the 75 and 5 to kind of make my wife happierish...?
We can help walk you through plumbing if you need help. Sumps are fairly easy - decide what brand you want, refugium in the sump or not, skimmer or not. Figure out how much flow you want through the sump and get an overflow that can handle that and get a return pump that outputs that much or close. Plumb the return up a couple of inches, add a tee and a ball valve offshoot from the return line to help with better regulation and then glue all fitting that are not directly above the sump or in the tank. I glue the 45 from the return pump only on the downstream side, the 45 going up to the tank on both sides, the 90 at the top on both sides and the 90 dropping back into the tank only on the upstream side.
I know it looks like a lot but it's just like sprinklers. PVC is easy to work with for the return.
From the overflow use some sort of flexible tubing.
We can help walk you through plumbing if you need help. Sumps are fairly easy - decide what brand you want, refugium in the sump or not, skimmer or not. Figure out how much flow you want through the sump and get an overflow that can handle that and get a return pump that outputs that much or close. Plumb the return up a couple of inches, add a tee and a ball valve offshoot from the return line to help with better regulation and then glue all fitting that are not directly above the sump or in the tank. I glue the 45 from the return pump only on the downstream side, the 45 going up to the tank on both sides, the 90 at the top on both sides and the 90 dropping back into the tank only on the upstream side.
I know it looks like a lot but it's just like sprinklers. PVC is easy to work with for the return.
From the overflow use some sort of flexible tubing.