That's what 'floating' is. However, the proper way to put an anemone into your tank is to drip-acclimate it (after a bit of 'floating'). If you notice on the left part of this website, one of the icons is "Acclimation," follow that.
Additionally the 'Atlantic Carpet Anemone' -- Stichodactyla helianthus is really not the best choose for an anemone, they get big, over a foot in diameter, and have a very potent sting. Large carpets have taken down heathly tangs. They are also known to sometimes eat clownfish that try to host them (as they are no clownfish in the atlantic).