Exactly, thank you.
However, that's a poor stero type, as Tokis mentions attitudes varry. Take my Bala Sharks, those two are the sweetest, they're like, not at all agressive towards my other fish.
However. Again like Tokis said, once a Black Shark takes an unliking to a certain fish, they won't stop harassing them. I know this from personal experience, considering my black shark isn't very if at all agressive towards my electric blue guppy, and several of the others and either of my Bala Sharks. But my Danios and like, two or three of the certain guppies, he will go after if they even come with in a few inches of the stone he's claimed. The others can come near it and do whatever with out so much as getting looked at.