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It's a zoa of some persuasion. I have no familiarity with the "brand names" that so many stores use to sell them. They are very hard to I'd even in person as the species tend to be highly variable depending on conditions. Their size and color changes quite quickly to suit their current needs.
Button polyp is a generic term for zoanthids, and the one that I would generally use. It is a safe name. A lot of be people today want specific names though, and that is very hard to do. It has led to multiple names for the same thing.