Can you keep yellow bellied turtles with Oscar fish?

The slyder requires different lighting than the Oscar. The trutle may try to eat the fish. Unless he is a larger fish. The slyder does not require a temp controlled environment like the Oscar. They also require different pH levels. You could try it but I would not expect great things for the Oscar. Turtles are also very dirty and may require another filter poss and under gravel. To make sure you turn over enough water to keep it cleaned.