It really needs foods in a smaller micron that it can catch. DT's oyster eggs, smashed up cyclop-eeze, crushed sweetwater zooplankton. You could try also smashing the mysis..Piscine brand is best. One way they reproduce is by budding and dropping babies. Is the green stokesi the type that you have? As Bang said, it is the one that does the poorest in captivity, and unfortunately the most often available.