Just looked at hatch rite and it's pre moistened so you are supposed to just pour it into the tub and you're supposed to be good? That can only be true if your egg tub is 100% sealed and you are reading 99% humidity on the hygrometer in the tub! Concentrate on sealing the egg tub for your best result. Don't ever use hatch rite again if you can avoid it.
Yes, the idea is that you're supposed to pour it in and be done with it. The tubs had condensation for the first few days and then it dried out.