Well I orderd some "cured" fiji rock cheaply and well you get what you payed for. Anyway, the rock had a lot of die off and since I didn't see I just put it in my tank. Is it normal for the rock's critters (ex. Sponges, worms, coral) to just go all fuzzy and white then just turn black? Like if its just rotting away. Which it probable is. The corraline algea is beginning to turn white but most of it is keeping its color. This set up is new and I am a complete newbie and probable always will be. I' still learning so please don't flame when I said I don't have something. I have a 2" sand bed of just sand from the beach that I made sure was clean (its not live). A berlin air lift skimmer (60). A Maxi-jet 900, a good heater, and sadly a 250 watt work light that over heats the tank and is horrible yellow. I do need to change some water since my salt is a little high but I don't know what else is going on. So basicly, whats happening to the rock when its curing? When do I know the rock has cured? By the way its 15 pounds in my 20H.