Guppy 

In Europe is called queen of the aquariums.

There is many aquarium bred varieties of this species available , most have elongated finnage and gaudy coloration.

Once fertilized the female can born several times.

Water conditions  :

Temperature: 17 – 28 °C

pH: 7.0 – 8.5

And immportant is that you dont keep them with fin-nippingn species as tiger barbs,siam fighter etc...