mildew Q

[Phrasty]

ok I am planning to breed in the future, but when I think about the incubator set-ups i cant help but to think that since the humidity in the incubator is 100% and the eggs are on "moist" substrate how do you avoid risk of mildew or anything like that growing on either the substrate or worse on the eggs. Is it an issue at all?

The incubator woud probably be home-made....cooler-type or wooden w/ insulated aquarium tank.

thanks for any input.