Rather thats what the package always said. I dont understand it though. Ive never used live sand or gravel myself soley because of the fact that i didnt understand and didnt want to risk killing fish or anything. Ive seen it in the petstore and really looked at the package today. It says that the use of live gravel/sand cuts out the need for cycling your tank. but how? how cant just that little package cut out the need for cycling a tank?(cause ive only ever seen small packages, MAYBE a pound per package) If someone could explain that to me i would appreciate it.