Long tentacle... sick... or part chameleon?

[ponokareefer]

I have read on numerous places that you should feed smaller items, like Mysis. to anemones. I just use a turkey baster and spray it in their direction. They catch a bunch and eat it. And unlike LPS corals, nothing takes things from anemones, with the exception of host clownfish, but that is rare. My cleaner shrimp have tried, and just about become food themselves.
As bvlester pointed out though, it probably lost its photosynthetic cells if the color doesn't come back right away. This was probably due to stress. Give it good light and feed it at least once per week. I target feed mine mysis 3 times/week, and they catch other food during feedings as well. My 2 large anemones started out around 2 inches and are now over 6 inches since the summer.