[ReefDave]

I use it in my tank because I got a bottle of it for free. Supposedly its basically super fine ground up calcium that "sticks" to the LR and makes it easy for coraline to get it (whatever). Its also got iodine in it. Its just another supplement, mostly useless I would say (but then again the coraline in my tank took off after using this but, I belive any Ca going into the tank is going to promote coraline growth and my tank is still pretty new so, it could also just be the tank settling in and things are starting to grow naturaly.)