Please Connect Air Pump to the other end of the control valve to add oxygen into the incubation room, which the air pumps should be bought additinally and the power of air pump is not less then 2W. Adjust the control valve to control the speed of water inside the incubation room which will control the height of jumping for fish tumbler eggs. The height of the jumping of the tumbler eggs should be about 1cm; Keep the incubation room vertically, not oblique, adjust incubator to the suitable height and keep the hole a little higher then water level. Refer to the water level of the installation drawing.