Personally, I'd take out the one(s) that hatched yesterday, sometime today. When you do it have a warm damp paper towel or two to toss in to help bring the humidity back up quicker. Any chance the 5th one will finish soon, maybe do it when that one is done too.
If I do this should I take out the one egg that's not pipped or leave it? Do I have to worry about it exploding?