Blue Topaz Guppies Portion Size You will receive a mix of males and females. Description Our Blue Topaz Guppies are locally bred. The males have red through the tail while the females tend to have blue.When buying Guppies we recommend either going all males or a ratio of 1 male to 2 females or more. this is to ensure the females are not getting too stressed out by the males who will constantly chase them wanting to breed. A great tropical fish for freshwater aquarium fish beginners, the Guppy is a very hardy tropical fish that is also a very prolific breeder. The male Dumbo Ear Mosaic guppy is easy to distinguish from the female because the male is usually more colorful with extremely colorful and large caudal fins (tails). The female is usually larger, thicker bodied, with less color and a smaller cuadal fin (tail).