question about a long tenticle anemones.

I just put in my tank what i think is a long tenticle anemones and during the day the anemones look fine but then the first night in teh tank i turned off teh light and woke up the next morning and the anemones tenticles all shrunk and were a deep deep purple, so last night i figured i would leave the light on to see if it was not having light that caused this and the same thing happened? is this normal? can some one explain to me what it means when all the tenticles shrink to about an inch long are very thin and a very very dark purple? im at work now so i dont know if the anemone looks normal again or not :confused:
 
Possibly just expelling waste. I freaked out the first time it happened to me.
 
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