it sounds like the little guy may be shooting with blanks at the moment. He may need to get a little olde rbefore you try again. The ventilation holes are very important in getting a good hatch. I have one directly behind my fan and another down at floor level. Oxygen in and CO2 out. CO2 is heavier than oxygen and will sink to the bottom and get moved out the hole due to the positive pressure of the air hole behind the fan. I have had some pretty good hatch rates with my old wine refrigerator incubator. Good luck and keep us posted.