Oscars are great but you have to watch out for HIH (Hole in Head Disease) You need to become well educated on the disease and how to prevent it before keeping them. I made this mistake and Its leading my 14 inch Oscar to death.

I have put hundreds of dollars trying to get rid of it and its very hard, but has been done. I'm just not having much luck with it though. I just wish I knew more about keeping them so I could have prevented it. And i would hate for a fellow fish begging fish keeper to go through the same.