I don't believe flow rate has much effect at all over how efficient the protein skimmer is.
Let's say you are sumpless and your skimmer is in your display tank... is that completely non-effective? Wouldn't that be a closer scenario to having a high flow through the sump vs a low flow?
Does it matter if the same water is possibly sucked through the skimmer multiple times while in the sump or wether it travels back to the display and then back to the sump before being processed again? Doubtful.
What you do want is enough flow in the tank to keep things stirred up and sent to the surface so it can make it's way to the overflow and down into the sump to be skimmed.
As long as that's happening, it doesn't matter.
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-dennis
Elos Diamond 120xl | Elos Stand | Radion G4 Pros | GHL Profilux Controller | LifeReef Skimmer | LifeReef Sump
Photos taken with a Nikon D750 or Leica M.
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