What are your temperatures? If eggs are being laid and not hatching, I would say more likely its an incubation issue (either incubator is too hot or too cold) If all the eggs are obviously infertile, even with younger males, could be too hot for him to produce viable sperm.

Being rather late to do any new breeding now, may be an idea to prepare a different setup for breeding for next year, or breed earlier in the spring.
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PHLdyPayne

Forum Princess