GBTA srinking overnight

[micromount]

I have a GBTA for 2 weeks in a 125 gal tank that has 2 6' Actinics and 2 6' Actinic white VHO bulbs. I put it in the bottom of the tank when I got it and it had moved to the top of the L.R. by the next day where it has stayed since. It was 5" across.Yesterday I came home from work and couldn'd find any trace of it. I moved some of the L.R. and found it. It is now about 1-1.5" across hidden in a crevice.
During the day he had switched out the 2 Actinic Whites for 2 AquaSuns as the bulbs were at least 1 year old .
He didn't notice at the time if the GBTA was on top when he did it.
Is it unusual for the anemone to shrink like that?

 

[killingseed2000]

probably just expelling waste, they will do this from time to time.

 

[Acroholic]

probably just expelling waste, they will do this from time to time.

That's exactly what I was going to post....My two BTAs both did this within a day of each other. Came down to the reef and they looked like they had been stung or chopped up in a PH. Then I saw this long stringy thing coming out of the mouth, and figured they were just pooping!

One of them actually did this two days in a row.
Dave