From what I understand, females like a variety. I have heard its sometimes difficult for a 1.1 ratio to breed when it comes to red eyes. Though I have not experienced this myself, that's just what I have heard from others. The more males you have the better. That being said, I have bred my red eyes and also witnessed some breeding activity. My female wouldn't let my male on the first couple times he tried. She made him work for it. Maybe she is not ready? Are they in a rain chamber? Have you tried to induce breeding any other way besides just putting a male and a female together?