I recently freed up a 55 gallon (48 inch L) tank. I have three angel fish from an established tank that I want to move to this new tank. I was wondering if one oscar, 2 pictus catfish, and maybe an extra angel fish would be compatible and also if it would cause over crowding? I know that oscars are quite aggressive and have read that they can be suitable tank mates for pictus catfish. I am more concerned about the angel fish. I have had the three for around 3 years and their bodies are about silver-dollar sized. If an oscar is not compatible can you give me some suggestions for stocking this tank.