A couple of years ago when it first came out Bob Stark from ESV spoke at our LIRA meeting about this product. If I remember he and Joe Y from the Long Island Aquarium collaborated with this product. He and his company are local so I decided to try it. I gave it almost a year and it seemed to bring out some color, but I really didn’t notice a significant difference. There is the regular and the plus. The plus is a carbon source.