if you are feeding a quality pellet not needed. I do give all my fish a protein treat once a week, its freeze dried jumbo shrimp soaked overnight in Boyds Vita-Chem. I do not know if it really helps or not, but they love it. but pellets need to be the main diet always,. to much protein is not good for them.
as FYI Oscars are very fast growers for first 6 to 7 months. blink and he will be bigger.