The Cobalt Aquatics Egg Rocker is the ultimate fish egg hatching system. The innovative design is incredibly sophisticated and easy to use at the same time. Self standing legs keep unit upright on counter while harvesting eggs. A simple in-tank installation and hook up to an aquarium air pump, then an easy airflow adjustment dials in the perfect water flow to gently rock your eggs. The Egg Rocker provides consistent flow and gentle rocking that will yield the highest hatch rates you can imagine!