Coral not opening

[Ed Yaworski]

I have an Umbrella leather that I received on Friday now not opening at all for a full day. Was fine on Sat.,Sun.,and part of Monday then just closed up and has not reopened. Have checked al waters to be fine. Placed leather mid point in the tank some current on it .Using 4 power compacts 96 watts .Two actinic and two white . Any ideas would be helpful. Coral was shipped to me but I do not feel that would have any bearing . TIA   PS  All other corals  in the tank are fine .                                                                                                                 Ed Yaworski