I have very close to the same setup as you, i've got a 150gal, with 50 gal sump that has a 20gal fuge as part of it. I have 2x 1.5" returns set up as a herbie, one side of the tank is done with the gate valve for flow adjustment, the other 1.5" is the emergency drain. the flow back to the tank is done through 1.5" PVC and splits to 2 x 1.5" going into the tank(I'm planning on choking these down to 2x3/4" for some more velocity comming out of the nozzle) I've got 3x kora 4's for flow in the tank and using a dart gold pump for the return. I've got a bunch of stuff T'd off the return, my carbon/refugium are right now, and once i change the nozzle's in the tank i should have enough back pressure to put my pellet reactor on there too.
The Dart Gold i'm using has LOTS of flow, i have a dump from the outlet back into the sump to be able to change the output, i usually run it dumping about 1/4 of the flow back to the sump right now. I lost a lot of flow going to herbie, the 1 overflow cannot handle the amount of water that is needed. I had duroso before but was having problems with microbubbles.
I'd suggest going for it, i'm wasting a bit of flow right now, but saving on heat since i have reactors running off the return rather than having individual pumps.
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