Zoas and Acans not open :(

[zlin0524]

they havnt been not open for a week now, my water is good and other corals r fine too. can you look at my pics and see if you can give me some advices? . i was told to dip it in the reVive for few minutes .

http://i1202.photobucket.com/albums/bb371/zlin0524/IMG_1595.jpg?t=1315430378

 

[zlin0524]

 

[john90009]

somethings nipping at them most likly at night time- u have pepermint shrimp- i see sps happy in your tank so things should be ok with parameters.