77a8cecc_Reefkeeping_Acronyms__STANDS_FOR
[ACRONYM] NNR [WHAT IT IS] Method of aquarium filtration developed by Dr. Jaubert; consists of a Deep Sand Bed (DSB), a plenum and a protein skimmer. [STANDS FOR] 
Natural Nitrate Reduction
Reefkeeping Acronyms
STANDS FOR