WhipCityBeeMan. Odd, about the green mould, maybe the bees aren't eating the pollen patty. You didn't mention if they were eating it or not. I have never seen mould forming on pollen patties, and I would be curious too why this would be so. Did you buy the patties or make them yourself? Ventilation, perhaps may be the issue. Are there slots in the front of your inner cover? In a hive the moisture needs to escape, warm air rises and it must have an outlet. That is one of the biggest issues in colonies, if there is no where for the moisture to escape. Beautiful day in this great life, Cindi