Main thing is the eggs turning. I use peralite with my eggs and they seem to turn even when burried in the perilite. I think as the gecko grows it is turning the eggs. I wrot a post about this a week ago. Out of 11 eggs 5 have rolled slightly to one side. This seems to happen as the eggs are in their last 30 days before hatching. Around the time the eggs are starting to have a more round apperance vs an oval apperance.