Redfield is poorly defended as the way that is interpreted by most is wrong, there is no scientific basis to indicate that you must keep a ratio of 16:1 in your residual Nitrate and phosphate. Therefore is a lost battle.I think there is a small sprinkle of intellectual talking going on when this topic comes up. One of the more recent reefbum talks this subject came up and it was shot down quickly. Even though it was explained why it isn't applicable the other party kept saying but, but, but...
On the other hand no one can really argue against Redfield nutrient limitations as they are backed by scientific facts.