I used it for nearly seven years on a 500G ! you have to be consistent, I used all zeovit skimmers/reactors/lighting Beautiful colors, great growth, but it is expensive, and you really have to watch your corals and know the nature of everything you dose. I can recommend it, however today on my "nano" tank (125G) my smallest tank yet I am using Triton with a large algae refugium, and one of my favorite skimmers, deltec sc2060, fully automated with ecotech and Neptune and DOS So much easier I am liking it so far ! I do however still use coral vitalizer!