You are bidding on 4 Blue Sky Blue Endler’s Livebearer (Poecilia wingei var. “Sky Blue”) is an extremely colorful, peaceful fish whose small size makes it absolutely perfect for the nano or planted aquarium. This fish is very similar to the larger common guppy (Poecilia reticulata). It is very hardy, especially for such a small fish. This variety often displays the “double sword” tail in males. Females are less colorful, but many specimens still display the sky blue coloration.