every few months my female phantastucus' have laid two eggs each. I'm pretty sure they are fertile cus they are white, oval shaped, and solid. The shells are soft. Thay look great for a day or two then no matter what they shrivel up and turn yellow, one molded. I put them in small tuperware with moist coconut mulch, this last time I tryed moist vermicilite but to no avail. Are the females getting enough calcium? Any sugestions? Please