HELP anenome problem

[Craigdillman]

left for 2 days and came home to find my sebae anenome flipped over in the sand mouth wide open! No damage to the foot no disinegration of the tissue just flipped over and sucked in! No other corals or fish look to be in any distress im testing the water as im typing this.
Im thinking maybe the Lights may have not turned on for the day and a half that i was gone? Nothing changed in the tank prior i fed all the corals and fish before i went and have an auto fish feeder drops a few pellets in while i was gone

I left friday at 5pm and came home sunday (now) at 7


Uploading pics and water tests now

Would it dislodge if the lights didnt turn on?
Nitrates- 0ppm
amm- 0ppm
calcium- 480
ALk- 9dKH
phosphate- <.25
Salinity 1.026
Temp 81*

I turned the lights on looks like it started to extend and start to re-attach to a rock

[Craigdillman]

[url=http://s1304.photobucket.com/user/youngmedic1/media/IMG_2233_zpsa006e120.jpg.html][/URL

[Craigdillman]

This is 4 days prior ..........

[Craigdillman]

What could have happened in 2 days that i left?

i feed it every other day with mysis and plankton and left the tank with a suto feeder to feed some pellets to the fish while im out so idk

[Craigdillman]

almost looks like somthing stung it or clowns nipped it

[Craigdillman]

Didnt make it

[daniella3d]

It look like it had some sort of infection. On that pic it is obvious that there is some tissue dammage, and it almost look like brown jelly: