They prefer the water to be slightly alkaline, with a pH of 7.0 to 8.0. Because they adapt so well, guppies have made their way to countries on every continent except Antarctica. In some cases ...

Colorful guppies and malaria Introduced in 1921 to keep mosquitoes at bay, prolific “millions fish” or guppies (Poecilia reticulata) have spread to just about every waterway in the country.