Set up an aquarium that is at least 6 times longer than the length of your male. Please note that tilapia will outgrow a minimally sized aquarium very fast. For this reason, we recommend that you consider using an aquarium that is at least 48 inches long.

Fill the aquarium with dechlorinated water.
On one end of the aquarium, place a terra cotta flower pot that is at least 1.5 times deep and wide, as the length of your male. Place the pot exactly 1.5 times the length of the male from end of the aquarium, with the open side of the flower pot facing the end of the aquarium.
In the middle of the aquarium, place 5 sections of PVC pipe that are at least 1.5 times as long as your females. the diameter of the PVC pipe should be 1.5 times the height of the female with her dorsal (top) fin retracted. Bigger is not better! Stack and glue the PVC sections into a pyramid shape using PVC cement. The PVC pyramid should be placed with the open ends facing the front of the aquarium, to keep the females out of the line of sight of the male, while he's at his flower pot. And you can go to see the animal feed production line.

At the opposite end of the aquarium, as far away from the flower pot as possible, place a 2" cylinder air stone.
Filtration inlets and returns can go anywhere in the aquarium, except at the end with the flower pot. Be careful to not create a water flow through the flower pot with your filtration return, as it will sweep out the eggs, while the male attempts to fertilize them.
Set your breeding aquarium temperature to 85º. Use a metal heater that has an alarm and an external thermostat if possible. Tilapia tend to bash into their heaters daily, and can easily break glass units.Maintain a pH of exactly 8.0. Do not rely on test strips, use an electronic pH meter for testing.

Use a UV sterilizer if possible to eliminate green water caused by the phytoplankton in healthy aquariums.
Feed your breeding colony a high protein diet. Feed no more than 1/2 teaspoon per day to the whole colony to minimize growth.
When your female is carrying eggs she will look as if she's sucking on a jawbreaker. She won't open her mouth to breathe, and she will not eat when you feed her companions. She will swim at the food as if she wants to eat, but she will stop short of taking any in. Wait two days before proceeding to the next step.

Welcome to see the lima machinery.

Have a good day!