Oh, and as for the OP... I dunno what coulda caused that... Usually you don't see mold until very high humidity / heat... If you were in the 75-80% range and running like 80+ degrees I'd fully expect a petri dish... Otherwise I really don't know how it could have bloomed... Have you tested your hygrometer lately? Is it a large humidor? Do you perhaps need a small fan to move the air around a bit? (I use an "Oust" battery operated fan in my large footlocker humi. It runs a few seconds every 10 minutes i think... and without the scent of course!!!) Without it I can get some really dry areas and some really humid areas because of the volume of it. Where is the humi located? Is it somewhere where it might get direct sunlight and be heating up inside or anything like that?

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Luko:

Just keep in mind if you do, you're pissing off a dude who shaves with a sword.