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no clue but i'm interested since i have some too. From the research i've done it looks like they might be a species of Aptasia but i'm not positive on that.
Ive had these before. They are called "pseudocorynactis". They can sting other corals but are actually harmless because they dont spread to other rocks. I just left mine there and i never had a problem. Actually i think mine eventually dies off.