I would say PC or MH lighting makes no difference. Probably stress causes them to split. So either put them in a small tank or add an anemone crab. My theory is that 2 smaller anemones fit in small spaces better than a larger one so they split to have a better chance at survival. Also, they seem to do fine despite high nitrate and low unstable PH (I'm not recommending everyone go and do that though).
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