For the sump, I'm setting up a 120g wide, (4x2x2) holding my skimmer, three 7" filter socks, 5 gal bucket load of Seachem Matrix, live rock rubble, UV Sterilizer Pump, and going through a Reeflow Super Dart for return. Would have went with the Hamerhead pump, but cant beat the watts on these pumps. And really, my skimmer is only a ASM G4+. Need an upgrade, but skimmers are way overpriced for what they are.
Closed loop has a Reeflow Dart/Snapper Hybrid.
I have a 40g breeder tank that I am going to have full of sand and tons of macro algae. Will have it overflow into the sump by two 1.5" drains.