Clown Killifish (Banded panchax) - 'Epiplatys annulatus" Size: 1/3" - 1/2" absolutely stunning Killifish! The males grow to have vibrant colors and fins like many other killifish, these in particular are a very beautiful variety. Killifish have upward shaped mouths as they are mostly top dwelling fish that eat small insects on the surface of the water.