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Sure, just get a roo of a breed that lays dark eggs - Welsummer, Marans, etc. That will definitely darken the eggs, but they will probably not be as dark as the original roos ancestors, your lighter colored hens will dilute the color some, but probably make them better layers. I get some...

Glofish are not at all infertile. I know people that have bred them by the hundred in their tanks. If they were infertile there would be no need to patent them, the patent is to protect the market and ensure that the "right" people get a cut of every one sold.