I run a pretty low nutrient system. Very light bioload in 220 gal. My tank has all new corals in it due to an AEFW disaster. Anywho Ive been playing with Amino acids and rotifiers lately. Ive been dosing consistantly and track my daily dosage of each. Right now I am using Elos AA, ELOS pro Skimmer and Reef Nutrition Rotifiers. Ive been ramping up dosage slowly over the last 15 days so far and am loving the results! The slightly tan corals are getting their color back! The corals that had colors are getting super bright and vibrant. I havent used any other AA products but Elos seems to work. Unfortunatley I cant tell if its the Elos pro skimmer, Elos AA, or Reef Nutrition rotifier thats helping. Or a combination of the three.