Jaubert Plennums

I have recently been investigating reef tanks and I came across some info on
the use of Jaubert plennums.  Has anyone tried this in a plant tank?  Would
the effect be the same?  I keep several large chichlids in my 75G plant tank
and the nitrates are always a little higher than I would like.  I do weekly
25% water changes but lately the nitrates have crept up to aroung 15-20 ppm
wich has led to a small algae problem.