There is no need to aim for a big number at first. Set up a tank of only 20 gallons. To make the inner environment slightly natural, you should be have a lot of real or plastic plants in the tank. This will also help you save the babies form being eaten by the parents. The water should be treated in order to remove all the harmful minerals.
The temperature of the tank should be around 70 degrees.
Purchase nearly 10 dozen ‘feeder guppies’ from your local pet store. They are not expensive at all. Put all the guppies in the water tank.
Getting live food for your large predatory fish is a slow process. You have to be very patient to get the desired outcome. In the first three months, you will get nothing more than a few small babies. The quantity, however, will continue to increase with time.
Baby guppies will not be hard to catch, as they swim on top of the surface. If you have somehow missed a few babies, this could be a blessing in disguise. The young fish start breeding quickly after getting matured. So, your pool will continue to get bigger.