There are many different techniques to breed your guppies. The three most popular are called selective breeding, inbreeding, and out crossing. I will tell you how I breed my guppies and what you should have. I use the selective breeding method. To start off you should have at least a ten gallon tank (preferably nine of them), some kind of air pump, guppy food, some type of sponge filter, heater, thermometer(optional), and guppies. You should try to obtain a true breeding stock (purebred strain) of guppies. Generally you should buy one male and two female(Trio).

Before you buy your trio, you should have had your tank filled with water, your air pump and thus sponge filter running for at least twenty-four hours. Naturally, you could buy some water conditioners and live bacteria to speed up the process. Once you have bought your trio, put the object that holds your guppies into the water.(Usually a plastic bag or container) Let it sit in the tank for about a half an hour. When 15 minutes has passed, place some of the tank water into the container in which your guppies are held. This is to get your guppies use to the water quality of the tank. You may want to put in some stress coat at this time as well. About 15 minutes later slowly let your guppies into the tank. Do not feed them right away. In about 2 hours you may feed them a small amount of Brine Shrimp or guppy food. After this do not feed them until the next day.

Within a month you should be getting baby guppies. This is assuming that your breeding stock is not sterile. Upon seeing the baby guppies you should take them out immediately and put them in a separate tank. You may feed them some newly hatched baby brine shrimp. They may not eat right away but they will eat in time. You should keep them on this diet for about a month. Then introduce them to some flake food. After about a month feed your baby guppies baby brine shrimp at least once a day. I also recommend that you buy a variety of flake foods. If you have a heater, then put it in the same tank as the baby guppies and set the temperature at about 78 degrees fahrenheit. In about a month or two you should separate your baby guppies into two tanks. One for males and one for females.
In order to tell if your baby guppies are male or female you will need to look at them in the light against a black background. Females have a blackish dot (gravid spot) near their vented area or anal fin (where they go to the bathroom). Males do not. You will have to look at them very carefully. When in doubt, make the guppy a male.
Once you have separated your guppies, keep them on the diet I have explained above. When they are about 2 months old, place all the females into a differnt tank as well as the males. This is to make sure that these guppies will not eat or nibble on the new batch of guppies. You would want to place your baby guppies in a new tank each month because every month you should be expecting baby guppies from the original trio. When they are about three months old, they should be pretty large. They are probably around an inch length. Within a few generation you should select your best trio and breed them. If you are not satisfied with the batch of guppies you have, than just wait until another batch comes. You should get baby guppies every 28 days. Give or take a few days depending on the strain of guppies you breed and health conditions. Then you should repeat the steps I told you.

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