Make your own hatching vessel Save your time and Money. Every Kind of Bottle can be your Hatching Cone!! No matter Small one (600 CC) or Big one (2000 CC) All you have to do is 1. Select one Bottle and Cut the bottom of the bottle 2. Screw the Screw top tightly on the bottle 3. Connect the air tubing from air pump to the yellow air adjuctable value 4. Fill the water into the hatching cone and add your brine shrimp eggs and seasalt into the water Now, you hatch the brine shrimp. So easy, so funny!!