Well, with mine. They spend a day or two cleaning a spot on a rock under or near the anemone/host. Scrapeing with their mouth/teeth away algae and any life/preditors of the eggs to make a nest where they take turns passing over the spot. FM lays down eggs and the male fertilizes them. Take an hour or two and then the male will stay there guarding and fanning the eggs and the FM goes on search and destroy missions around the home. Takes a little over a week and then the other fish get a treat to eat.