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hi, where did you find this post?Need a lot more information for this. The 3 weeks is how long it takes any coral or invert to really show that the environment is not sufficient. How old is the tank? What are your parameters? What lighting is being used?
Edit: Welcome to R2R!
Bad advice for a stressed anemone. Should just give it time and ensure stable, proper parameters.Try feeding it to see how that helps out. There may not be enough nutrients in the water. Mine aren't happy when nutrients are low.