Leave it be. You will find this happens when you keep corals. They “sulk” for days, some even weeks. As long as your water is spot on you will be fine. As you are probably aware softies are more tolerant of conditions as opposed to SPS.
On a side note of you are thinking of Mushroom’s be very.. very careful, before you know it they will have taken over your tank. Another to be wary of Xenia .. looks great excerpt it’s like Japanese knotweed ( maybe not that bad, but you get my point)