Stefany, I've been struggling with this one. I was helping someone ID some 'mushroom coral' and realized my little skeletons might be coral too.

The aquarium specimens I see online look about 2 -5 inches diameter I think, sitting on someone's fingers, but juveniles would be smaller, yes? One species was attributed to Thailand. If you can find more, that would be great. Much of what is available is on aquarium keeping sites, and dealing with live organisms.