Quote:
Originally Posted by Mr.Peanut
Night time......

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Not to worry, this is common with diurnal cycles for the anemones. They gain little if any advantage having their tentacles expanded in the absence of light (as there is little potential for photosynthesis in the dark and the daily march of plankton from depth to surface and back only occurs at the beginning and the end of the day).
This reduces the chance of predation by night time fishes and other potential anemone munchers.
Check out "Hexacorallians of the World" for more info regarding behavior norms for anemones.