Question: How can i increase the chance of my axolotls laying eggs

[smily sam]

hi i have what i think to be a two male and a female axolotls (if try and put some pictures up could any one tell me if they are boy or girl or not im farely sertain that they are boy and girl though) i was wandering if theres any chance of them laying eggs qwicker ive already givin them low light levels, the water tempeter is low and there are plants in the tank so they can lay there eggs on somthing but does any body whos bread axolotls befour no any ways to make them fertile and breed faster e.g special diat or somthing.
sam