Lighting is not what's stressing this anemone; it's water quality and salinity. 80-82F is okay for temp. Maybe as you're doing the things that have been suggested you might do some real reading about keeping anemones in aquariums; it's not an easy task, and the vast majority of anemones caught in the ocean die shortly after being placed in aquariums. Here's an introductory article about host anemones to get you started:
http://biodiversity.uno.edu/ebooks/intro.html
Yours is E. quadricolor, and it's definitely the best choice as far as survival in aquariums goes; maybe yours was even tank raised. But you're still going to have to learn the basics about it's habitat and dietary needs. Good luck!