I have had these two oscars since February. They are approx. 9inches. I took out my pleco yesterday, and when I got home from work, it appeared that the oscars had spent most of the day moving rocks. The have cleared a big circle on the bottom of the tank (still working on it today). They are swimming side by side, when not moving rocks, lip locking, wagging their tails in each others face. Are we getting ready to do the deed???