Hmm, I've considered taking the HOB filter out of my Edge 12g. Do you think there's enough flow with your powerhead for good oxygen exchange in the water? I have a Koralia 425. Sorry if that's a dumb question. I'm a newbie still!
I really wish there was a way to test for oxygen levels. I have 33X turnover with the Vortech at the lowest setting (200gph) so I am pretty confident that I am getting enough flow for oxygen exchange but its hard to compare to the AC20 because it breaks the water surface.