Nooooo! Not again!!!!
(1) Only two anemones (E. quadricolor and H. magnifica) are known to asexually reproduce with any frequency in the wild. Only these two species can be fragged with anything approaching a 50% or better success rate (ie over the long haul you end up with more anemones than you start with). Even for the hardiest, most prolific clown anemone (E. quadricolor) the success rate is not 100%.
(2) Some anemone species that have limited or no records of asexually reproducing in the wild (S. gigantea, M. doreensis, et al) have NO record of EVER being successfully fragged. Lots of people have tried, lots of anemones have died. Zero successes.
(3) Some anemone species (S. haddoni, S. mertensii, et al) have occasionally been fragged successfully, though success rates have at best been 50%, and the jury is still out about the long term impact to the fragged offspring. In other words, an anemone was cut in half, one half lived and one half died, and the half that "lived" ended up slowly dwindling and dying after a short period (perhaps a year or so).
DO NOT BE FOOLED by videos of people cutting anemones in half! Any fool with a razor blade and cutting board can cut an anemone in half! You will likely just end up killing a beautiful creature as well as wasting a lot of money.