A friend of mine has 10ish red devils. They are all around 2 inches. Some are the normal shades or light redish but some more like they have black stripes and are more white, one almost a blueish shade, contemplating this one. Anyways, I am trying to find a male, besides looking for longer fins or some small hump, is there any good way to know for sure? Or am I better off selection the coolest looking or most dominant?