I actually just received this today. I ordered ARC reefs coralline in a bottle. They put a minimum of 6 different species of coralline into the bottle. I called and talked to the guy, he was extremely friendly and knowlegeable. He told me how they make it, and that by having many different species introduced, you are bound to get at least 3 or 4 that love your tank, and really take off. He said that they have done around 100 starter tank tests with this, and in nearly all of them, it took 4 weeks to develop the coralline "chickenpox" dots all over everything. I also support the work they do in miami building reefs in the atlantic. If you look on their site, they have some amazing live rock and coralline.