From this beautiful photo submitted by Peter and Christy Tyrrell of the Rose Bubble-Tip Anemone in their 51 gallon cube reef tank, by all appearances it looks like a juvenile rose colored variety Entacmaea quadricolor.
Sea Anemones are not the easiest things to keep alive and in good health in an aquarium. Here are the summary and analysis of the Host Sea Anemone Survivability Survey. The information here could help you to easily double the life span of a sea anemone in your aquarium.