How do you breed guppy fish in a half gallon tank?

just leave 2 mails and 1 female guppy in the tank with no other fish in the tank at all times.-Shocker There should be 3 females to one male. If there are too many males, the females will get stressed out. I would recommend a larger fish tank than a half gallon. Maybe a 10 gallon tank. Remember, you are going to have some babies. Where will you put them?