looks a heck of a lot like the nems i have..they split like mad, too
seems like whenever i see one leave the main cluster of nems, it will wander a couple of feet off...and leave a trail of anemone-lings in it's path as it returns to the main cluster
counting the ones that are still only the size of a quarter, i have about 25 of them in my tank...started with 9 of them about 8 months ago. like Random Aquarist mentioned...i think some strains just split a lot.