Purple Digitata Help!

I have three good size frags of purple digis that have been my tank for about 3 months now. They are growing like weeds and the color looks amazing. But tonight i was passing my tank and noticed that all of them have their polyps tucked away like something was bothering them. hje strange part is that I have an orange digi right next to them and it looks healthy as well as caps and caps. Should I be concerned?

 

I really don't know, but ive experienced the same phenomena with my orange digi and a couple other montis. It lasts a few days, then suddenly they come back out like normal. Almost like leathers do when they "shed".

 

Mine do that every once in a while. Happens with some of my other corals also. I would worry unless it goes on for several days or you see a color change.