no bud rot only happens on big buds dense buts. most of the time people get it is when they dont dry them right.
PM is white and will be on the top of the dirt and some leaves.
as uncle ben would say. Just keep it simple and grow your plants like you would tomatoes. Remember, pot is a weed and thats where folks screw it up is by overdoing things.
looks like there r doing fine. some strains just take longer to transition from veg to flower. growth some times can stop for 2 weeks while they go into flower.