Anemones are not required for clowns and frequently die even in the hands of experienced aquarists. They did a survey looking at the average life span of an anemone in an aquarium and found that the average was 14 months in the MOST EXPERIENCED hands. For new aquarists it was a matter of weeks. When they did they dissolve into the water polluting it was all kind of nasties...... A organic bomb if you like!!