Guppies, Sailfin Mollies, Swordtails, and the Platy, or Moonfish. These fish are very colorful, and easy to increase. They have no qualms about mating, and will do so constantly. If you choose to breed Guppies and Platies, a word of caution, they will interbreed and produce unappealing, sterile offspring. Males do not fight as is demonstrated by Mollies and Swordtails.
Guppies come in several bright colors, with new strains being developed all the time.
The male will usually have color on his entire body, while the female's finage is colored. The males constantly are courting the females by spreading their fins and fluttering their beautiful tails. The male can be white with a bluish, greenish, or pinkish cast to the scales. They can also be black, or speckled. The male possesses the beautiful sailfin, which can extend the whole length of the back and be higher than the depth of his body.