Does anyone know the growth rate of a tiger Oscar. There both around the 3.5"mark. Its been years since I've had an Oscar and have no clue as to how fast they will grow. Right now their diet consists of market shrimp, pellets, blood worms and krill. They're in a 90g(48"x18"x24") and I do a 35% water change every week. I also have a 3" Green Terror in there with them.