We don't recommend breeding until the female is about 2 yrs old and only when she is in good health. As far as infertile eggs go, they can become gravid as young as 8 months but that doesn't always happen. Hope that answers your question.
I just set Swordtail's timer for his bath and paused it so I could actually fill his soaking bowl up and he crawled over my phone and canceled the timer
Mirage came out of brumation on April 26. He was doing great. On May 2 he started acting funny. We just redid his tank, and he keeps going into one of his hides. He just lays there. He shows no intrest in food. HELP!