First-time poster, long-time follower of Reef2Reef. My cousin just picked up a 20 gallon used tank and we were able to identify all of the coral variations in it except this thing. It's about the size of a zoa polyp but looks more like a mushroom. It's the only one in the tank and there are no other mushrooms in the tank but is it maybe a baby Juggernaut Bounce, or St. Thomas shroom? I'm kind of baffled. Any help would be greatly appreciated!