I use the Carbon Doser external reactor and it's very efficient on larger tanks, hidden under the stand, fully dissolves all the gasses before they can enter the tank, and never needs cleaning, plus I detected no reduced flow.
I think in line or in tank diffusers are fine for smaller tanks and I have never used one so I'm no authority on them but I know if you see bubbles the gas has not dissolved and they need to be cleaned.
This is my opinion on reactors, the simplest model is a RexGrigg reactor, a step up would be the Cerges reactor which is a RG with a wider housing and a center tube, and the ultimate reactor is the Carbon Doser which is a Cerges with foam half way up the center tube and pump to recirculate the water and break up all the gas before it call leave the reactor.
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