Cool...you'll have some fry in no time. What size tank are ya housing them in. For the biggest yeild you'll want to get some grow out tanks. It's gonna be 4 months before those fry are big enough to feed to the monster oscars you have.
a 29 is a good enough size for a pair just cant have any tank mates!
but you dont need to buy 10 all u need to do is get a male and a female and that should get u a pair! cons are the easiest to breed! first cichlid i ever bred!