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The purpose of the refugium is nutrient export.I've already addressed this in previous comments.
I have a very successful refugium. I have to dose nitrate and phosphate to keep my levels above zero. This is starting to become a common "problem" these days. I have absolutely no problem letting detritus digest in that chamber. It will allow me to dose less and run my refugium brighter and longer, resulting in greater oxygen production at night and a larger PH boost.
I'm totally fine with that "downside".
Driving levels too low? Then light it less hours per day for less growth or keep the ball of macro smaller or don't feed it as much... Or take the macro out of it and put rocks in there for pod hotels....
The detritus will settle somewhere, you don't need an extra container to make it happen.
This whole thread is traveling down the silly slide.