to start off my daughter had gotten a fish tank and picked out a few fish 2 male pineapple swordtails and a pineapple female and a female guppy and someone gave her a male which i didnt know about till after they were in the tank which was a 20 gallon at the time.to make along story short i eventually had to aquire a 55 gallon to hold all theses juvenile guppies about 50 or so and 12 female swordtail juveniles.