anemones tend to split when stressed, so if, and I advise against this,
you let your tank parameters slip, stressing the anemone it may divide.
but doing so puts your entire tank at risk. as well as the life of your
anemone. I would reccomend trying to swap it for a smaller one with
some one who may be interested in a lager one.Surely a safer route than
trying to stress it into splitting.