i really am not sure the use in a 29 as well. Had a skimmer in my biocube and it seemed more of pain then it was worth. Chemi pure and floss worked great for me. if not the tunze for the biocube is rated well
After some tuning and realization that I had my skimmer too low, I love my Cadlights PLS-50 nano.
It fits my old Oceanic BioCube and my brand new Coralife BioCube.