The acclimation time is not that long but IME
, anemones are not as sensitive to it as other sessile inverts. Could be something amiss there non the less.
Nothing you've posted so far lends to a problem with the exception of lighting. This part:
Originally Posted by firefly386
it still red under side
Suggests you have an LTA or other type of anemone but not a BTA. They are for the most part quite sensitive to light quality.
What kind of light/how many bulbs do you have to get 350 watts?