i have an oscar i belive is about 3 1/2-4 1/2 inches, depeneding on his aggresiveness i may have to get rid of him (preparing to put him in a tank with a 3 inch senegal bichir, 3 inch tire-track eel, and two other fish)
I have a bastard oscar that attacks tankmates, attacks me, and smashes my thermometer. Begs for food constantly. Pouts when I clean the tank. One of my favorite fish.