Once cut, obviously my anemone was stressed out. Fortuneatly, on the 2nd or 3rd day? it inflated a little, my goal was to feed it as soon as possible because it can gain some more nutrients to regrow. So at night, when all fish was asleep i gave it a zoe absorbed silverside and it ate it happily.
Try aiming for pristine water conditions and put something like a sponge that fits into your powerhead so it doesnt happen again. What i do is stick caulpera on the powerhead so it acts like a sponge and it covers the powerhead which looks pretty good to me
. Despite the fact that when the caulpera tries to root, it may clog up your powerhead and damage the motor, so its pretty risky.
If your stats are fine, and hopefully the damage wasnt too big, it shouldnt be a problem. Do you have any pics of your anemone at this stage? How is it doing right now?
EDIT* oops, forgot to mention that if your anemone is dieing, take it out quickly. It is believed that a dieing anemone can nuke your whole tank.