Blue Fin Killifish, Lucania goodei, Florida native species. They often live in shoals in the wild, so they like company. Gets about two inches TL, males have the bright colors while females have plain fins. Temperature from about 66 to 74, I never found them to be picky eaters, even wild fish adapted quickly to flakes. One of the few natives that occasionally is seen in commercial sources due to their bright colors and community friendly demeanor.