I recently brought a red oscar for my 45 gallon tank and he’s doing great I taught him how to eat out of my hands and jump up and eat. He’s not to big he’s about a juvenile what’s you guys experience with Oscar’s
They are ambush predators and will get along with other fish if put in a mixed collection while young, but once they are 4 or more inches long, they tend to dominate smaller fish if they didn't grow up with them.