Actually, I think that they are grumpy. I have a 100G that I could sell all my fish in there, and keep an oscar in there. It's just a common fact that most people who get oscars cannot provide the proper accomidations for them because they simply get too big. I hate oscars not only because they are mean, aggressive fish, but also because they are tankbusters and look ugly and constantly grumpy. In the real, non-MFK world, most people that have tanks have tanks less than 50 Gallons and know only a fraction of what we do. However, if you like keeping oscars, go ahead and do it. I'm not gonna rag on you for doing your passion!