Good choice of fish!!!!! Oscars are very cool. Intelligent, responsive and so much fun to own. Your tank would only be big enough for one, as you said. Like Caryl has already mentioned, lots of filtration is a neccessity, turning over your tank about 10 to 12 times an hour is good. They are absolute pigs at meal times and tend to spray a lot of their food out their gills. They're fairly well behaved when young, but it doesn't last. Be prepared for monumental amounts of destruction when he/she gets to about 8 or 9 inches. Ours went through 3 heaters, 2 filter outlet thingies and innumerable plants before he started to settle down. Be warned that from a very small size, they will try to eat any other fish in the tank that will fit in their mouths and sometimes, even ones that won't fit. They tend to bang around their tank without much regard for their surrounds, so smooth rocks are a good idea, otherwise they will scratch themselves up on a regular basis. I hate to be a traitor here, but the guys at this site http://www.worldcichlids.com/yabbse/ are the best for oscar questions of all types. They helped me a lot with mine