If it's just one Oscar then it's just trying to move the rock. That's how they push things.Does anybody know if the male or female cleans off the flat surface to lay the eggs on? Reason I’m asking is my Oscar, within minutes of me placing a flattish stone in the tank has now avidly been scrapping his/her? Lower jaw all over this rock. It’s the only Oscar in the tank so just curious if I have a male or female. And should I keep an eye out for aggression towards tank mates with this new breeding behavior?