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Mangroves do absorb nitrate and phosphate, just not as fast as some other things like chaetomorpha, prolivera, mexicana, racesmosa or taxifloria.
How large is your display that you are keeping a 100g refugium? Depending on your stocking it might be possible to seperate some of that and grow something like xenia in there as well, which will also filter some, but can be sold for some cash pretty easily to many LFS's or wholesalers.
Just a thought.
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120g mixed reef
90g QT
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