Leaving anemones alone is the best practice. They will find a happy spot (but maybe not yours) Your tank is a little too new to be stable enough for an anemone. Usually 6 months is the recommended time before addition of such. Concern is , your tank is subject to ammonia and nitrate spikes and the anemone may actually weather the coming ammonia spike better than the clowns do but it will shrivel, expelling water, until the ammonia goes away. You need to test for alkalinity, nitrate, and ammonia.
Salifert and hanna are good brand kits and are easy to use. Lighting and flow are also vital to the anemone. I must ask, How did you acclimate (introduce it)and for how long ?