Simultaneous crustacean molt?

[RCFA]

Anyone ever notice their crustaceans all molting at the same time? Both my peppermints molted today and I noticed at least 5 more copepod molts around my tank. I'm trying to figure out what would cause a large number of crustaceans to molt at the same time? Could it have something to do with calcium levels in the tank? I have been dosing to raise my calcium levels slightly over the past two weeks, which may help in the generation of new exoskeletons, but what would cause many molts at one time?