got mine with 2 Pbass, a silver arrow, and an asian arrow. tank mates in this case are either the same length or twice as tall. had him with 7inch dorados and 9inch odoes, he ate one of each. micro's about 20inches. None of the fish grew up together and were added after the micro. I think a lot has to do with luck of draw. I've heard some micros kill fish they can't necessarily swallow so...