MEETING! Clear the air. Don't warn them and get adrenaline pumping, just call the meeting and put it all out on the table. Ask whats the problem, make notes and decide how to resolve it after the meeting after you absorbed it all and had time to think it through.
Worked in a Salon SPa with 18 to 25 people. Wow was that a lot of hormone to deal with. Good luck. Some people will feel better, some won't say a word, some will stir the pot, and some will roll with whatever.