I'm only on my second week of using Red Sea Reef Energy A/B and having seen positive results so far. Color and PE have seem a little bit better thus far coming from having horrible color on some of my older coral with some of the newer coral, < 1 month in my tank, responding the best/fastest. My PO4 was at 0ppm on a hanna to .03ppm after a week and my most recent being .06ppm which is a little higher then I wanted. The PO4 I'm sure is more to do with the fact that I am feeding twice a day vice every other day like I was and turning off my carbon/gfo filter.