ohh, i read it in a book, it said to put the severed part of the cutting in a "high flow area" and leave it there for 24 hours, it also recommended a powerhead, it said, lots about treating water for this and that to make sure it doesn't succumb to infection etc, but personally i think there is no need, why make a simple process of cut coral, glue to rock, put in tank into a hard process of adiing this and that to water and treating the coral for all sorts of things, IMO there is no need.