I was noticing my two oscars opening their mouths to each other then 1 was pecking at a flat rock and other was digging a hole in the gravel. Is this normal Oscar breeding steps? Or just coincidence? Never bred Oscars and I thought they were both male 1 is slightly larger than other but both are stocky and thick. I hope they are breeding but no idea! Hopefully someone can chime in. They are about 7.5" larger one, smaller is 6-6.5".