yeah irridesents, they are pretty innert as far as fish go and anything that can't be eaten or eat it will be kept alive.
as said, they do need room to grow and actually turn pretty sharply,i have two and they always wizz back and forth in the tank. bobbing and weaving around the decor.
i say gor it as long as everything's a good size to not be lunch.
but i hear that they like groups, anybody know if that's true?