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Origin:
Occurs widely in central America. Etymology: unk Synonyms: Molliniesia helleri, Xiphophorus jalapae,Xiphophorus rachovii,Xiphophorus strigatus,Xiphophorus brevis,Xiphophorus helleri helleri,Xiphophorus helleri brevis,Xiphophorus helleri strigatus First European import: Germany, 1909, by W. Schroot. Description: See pictures.
Temperature:
18-28 degrees
Size: Females up to 12 cm, males up to 10. pH: 6.0-7.5 Breeding: Up to 80 fry per female. Fry should be protected from the parents since they will eat their own fry as well as other tiny fish. Sexual dimorphism:
Males have a sword, besides the gonopodium. Sometimes females have
male traits! Prices: Between 1 en 3€. Additional: Numerous breeding forms exist. Picture references: Allpictures E. Naus. References:Baensch, H. A., Riehl, R.(1982): Aquarien Atlas I. Mergus Verlag, Melle, Germany. If you have any comments please mail to aquaworld
Origin:Mexico Etymology:
Named after Cortez. Synonyms: Xiphophorus montezumae cortezi First European import: Germany, 1964, by the Zoological Institute Hamburg. Description: See picture. In the picture the short 0.5mm tail isn't visible. There's also a variety which posseses a longer tail, 1.2cm. Care:
Can be kept in normal community tanks, although they should not be kept
together with other livebearers, since the fish will cross and I quote
Baensch and Riehl, another true species will become extinct Temperature:
24-28 degrees. Feeding: Omnivorous,all food is accepted. Size: 5 cm. pH: 7.2-8.5 Breeding: Easy, if the parents are kept well, every 4-5 weeks between 10-30 fry will be born.
Prices:Netherlands: 4€. Additional: If you can buy these fish from a shop, but there they have been kept together with other livebearers, you should destroy all the fry that's born in the first half year. Picture references: Pictures: E. Naus. References:Baensch, H. A., Riehl, R.(1982): Aquarien Atlas I. Mergus Verlag, Melle, Germany. If you have any comments please mail to aquaworld
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Care:
For the fish to fully develop larger tanks are required, minimum 80
cm, with planted regions on the side, and some free swimming space.
Water shouldn't be too soft, nor acidic, but the fish can live in
neutral water of 12 degrees dGH. Peacefull quiet fish that do well
in a community tank. It's best to have more females to a male
Feeding:
omnivorous. 
Sexual
dimorphism: Besides
a gonopodium the males also posses a small sword.