did you know an anemone has barbs on its tentacles and thats what the "sting" comes from? A healthy, happy anemone needs 24 hours to regenerate its barbs each time they touch somthing. The biggest reason most anemones die in captivity is due to over feeding because their barbs cant rejuvinate quickly enough.
In nature, anemones are considered almost immortal and can live hundreds of years but in an expierenced "reefers" tank the average life is under 5 years. No one can explain this. It is thought, that they derive some sort of nutrution in the wild that we are unable to provide.
I have an electric blue carpet anemone that is about 26" long and have had him for close to 3.5 years. Within the last year he has started to shrink much to my dismay.
Odi