That is a shot of a purple long tentacled anemone known scientifically as Macrodactyla doreensis. It naturally hosts Clark's (A. clarkii), pink skunks (A. perideraion), saddleback clowns (A. polymnus) and A. chrysogaster. They are a sand dwelling anemone that need atleast 4 inches of sand in which to bury their foot in order to feel "happy". As far as care goes, they are one of the hardier of the host anemones to keep, provided they are given a proper environment (deep sandbed, bright light, good water quality, etc.). I kept a purple one just like the one pictured on bluezoo's website for over a year. In that time it grew from about 6 inches to over a foot across. I eventually traded it to friend who still has it today and that was over three years ago.