Is it sitting on the rock like my one? If it is, odds on it is a Heteractis magnifica. If it is, then it will need a truckload more light combined with tons of flow. There habitat is reef slopes on prominent solid structures - your classic finding nemo anemone. They like to climb high for the light and current.
Distinguishing characteristics - tentacles of uniform thickness and do not taper at the tip - sometimes tips are slightly swollen.Contrasting column colour is destinctive (red,purple,pink with brown, green, blue or purple tentacles). Mine had a very purple base and brown tentacles when I got it. When disturbed the anemone "balls up" showing just the colourful column with a few protruding tentacles at the top. - The Reef Aquarium Vol2.