It looks like an Atlantic Sun Anemone, Stichodactyla helianthus. Sometime anemone split with stress. I think that was what happened. In your case the anemone died.
It was not a host anemone, these guys will eat all the fish including clown fish.
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Minh
My homepage is my album here at Reef Central
Current Tank Info: Reboot 320 anemones reef. Angels: Yellow Chest Regal(2), Flame (2). Copperband But. Tangs: Yellow, Purple. Wrasse: about 20 wrasses various species. Anemones: Giantea X4 (Breen, Blue, Purple and Multicolors), Haddoni X1 Red, Magnifica X1 Purpletip
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