If it splits be prepared for the the inevitable movement around the tank. I have one that splits around evry 4-6 months. The original always stays in one spot but the other moves around looking for it's own location. It may not be splitting at all. My anemone gets bubbles on it's mouth like that when it prepares to feed. If you notice the insides completely coming out like it's puking out it's stomach then get rid of it. It is dieing and will pollute your tank. It sounds healthy, just things to look out for.
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