They are exceedingly similar, just a sized up version. Easy to feed, they'll even go for algae pellets, but the increased size fosters a correspondingly increased territorial need. I have 2 dominant males in the tank, and they split it basically down the middle. The smaller males all have to camp out on the driftwood, or move around furtively. Their fights don't seem as sustained or as vicious as the way the atros fight though, and they never have split fins.