Rose BTA help needed

Hi all,
I purchases Rose BTA last Monday. It was a tank raised "split" about 3"
in diameter. Appered to be in good health etc. Two days later it went
missing, and I found it on the substreate behind the rockwork in
relative darkness yesterday. It crawled on a small piece of rock and
was surrounded by sand, so ithought it was stuck there. The guy looked
to be in prety bad shape - deflated and tentacled were very thin. Long
story short, i had to take half of my rockwork down to get to it. After
5-6 hours under good light the anemone seemed to inflate a bit but is
still about half of it's size.
Well, today in the morning its in a cave again hanging upsidedown.

Is this normal behavior or is it hiding from stong light (450W of MH
and actinics over 90 gal tank)?

Thank you in advance
Yuriy