many, not all bta's will split, not just rose anemones, however you have to provide them with pristine water conditions for this to occur. yosemite, soory to say, but that does look like just a plain ole bta. a rose bta will be almost electric red, and will look like its painted or dyed, however, this is its natural color.
rroberts, my false perc hosts in my bta, and for some reason loves my zooanthid polyps. if you cna id try to stay away from anemones unless you have the proper lighting set up for them, as they are just typically hard to keep alive in captivity.
good luck
jon