He means you should seriously consider removing it from your tank. How long has your tank been running anyways? I hope you do know that for your tanks sake and the anemones, they should not be placed in tanks under 8 months of age. Anemones need the most pristine of water conditions in order to survive and to live a full and happy life, and a tank of a young age can rarely meet that expectation. Water fluctuations are a given in young tanks, and even the slightest water fluctuations can stress out an anemone.
Also, the nem that cmor is talking about prefers a sandbed of 4-5 inches or deeper. Do you have a sandbed that is this deep or deeper?