All for Reef is pretty great even on larger tanks (mine is 300). I switched about 1.5 years ago from a calcium reactor in an effort to simplify. It has worked out very well. BUT, from what I can gather, AFR is best when you are trying to keep CA constant. When you get more and more coral and the ALK consumption goes up, then you have a situation like I do, where your ALK remains constant but CA and MAG very to very high levels. I need to reduce my consumption of AFR and add soda ash to keep ALK constant but allow CA and MAG to drop to the desired levels. This will also be cheaper for me!