If you are thinking of going with an ASM skimmer upgrade go to the G4X. I have both and IMO the G4 is a POS - seriously underpowered unless they have changed the pump from the Sedra 5000.
On my 190 I have a closed loop run with a Sequence Hammerhead that then goes through an Ocean Motions 4 way with each of the 4 outlets split giving me 8 returns to the tank. The OM devise is really cool and makes for good rolling flow along the tank. I also have 2 Tunze 6200 in this tank so it is high flow but I don't find the closed loop provides too much flow at all. Definately more from the Tunzes.
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