@ callingcalleen I think after 3-5 years old the shell on the eggs becomes so thick or hard the sperm can't penetrate and feterlize the eggs a male is good to go after a year or so but the amount of sperm would be small due to size so most People go with two males to one female but I don't need that many babies I say let the big girls be and try with smaller females and what ever males you have hopefully this helps.