Midnight Blue GalaxyPoecilia Reticulata midnight blue galaxy If you have been mesmerized by pictures taken by the Hubble Space Telescope, then this is the fish for you! Males mature to 2 inches and exhibit a marvelous galaxy pattern along their body. Once adults, their tails fill out to a half moon spread and range from a marvelous deep blue to a velvety blackish blue. Females mature to 2. 5 inches by 6 months. They have a pale gray, moon colored body with a striking