I don't think the sudden onset of mold has much to do with the air movement...probably more to do with these little bamboo rafts I got recently to stand the pots on. On further inspection, it looks like the bamboo was not liking the constant moisture. (Got rid of 'em.)
But I'll keep an eye on how they're doing, and if it looks like this is a repeat event, I will add another lil fan to the area.