cuban cichlid

Hi MFK, I have a 20cm (8 inches for the Americans) female Cuban who I intend to try and breed. I also have 4 smaller Cubans that are approx 5-6 months old (I think), the largest of which is 10cm and I am positive is male. How long/what size should I grow him to before I attempt to try mixing...

So my question is if have 1 125 gallon W/ common wolf fish 6 inch Endelzi bichir 6 inch Cuban cichlid 10 inch Jaguar cichlid 8 inch The Cuban and jaguar are a mateing pair I also have a 150 gallon W/red wolf 6 inch Fire eel Black diamond cichlid 4 inch...