What is the most effective way at removing NO3 or Nitrate from a system? I have heard some professional discussions with fellow Marine Curators at reputable Aquariums, and have heard arguments for Plenums, Reactors, Chemical filtration (additives), Biological filtration (fluidized bed filters), Deep Sand Beds, Large or frequent water changes, refugiums, and even the use of Sulphur tablets in the correct dosages. What I am looking for in this discussion is success stories in the way that you have created a nitrate level of 0.0 in small aquariums (up to 55 gal) and also discussion of why other methods have failed you. I will tally answers up at the end of the month and come out with the general opinion of which method is the best. I will post my findings at the end of the week following the end of the discussion. Hopefully, everyone will learn something from this, including me. I personally would prefer the use of combination of a plenum with a deep sand bed and calculated water changes when and if problems arise, but thats just my opinion, whats yours?