Yeah...oscars can breed around 6-8, Waldo is right, I figure thats about a year old. Oscar sexing is hard. The only sure way is to see em breed or vent them. Try to look at the fishe's underside, mine are easy because they look to the top for food when I hold my hand above it. Females will have a larger hole next to a small one...something like this... oO. Males will have two holes close together of about the same small size, like this...oo. Hope that helps.