"Biology tells us to shun any overtones of wickedness attached to predation and to see it as a natural process. We must regard the predator as an important regulator, because predators not only maintain the fitness of a prey species but also affect its behaviors and appearance, including body coloration." - Words of widsom from Daniel Knop to keep in mind when an aquarist is confronted by a predatory fish behaving a little too naturally with their tankmates.