That's a misidentification. I've patrolled multiple inshore flats in Indonesia and seen hundreds carpets from the genus Stichodactyla. There is a clear difference in tentacles of Tapetum, and juveniles from the other species. The top is image is without a doubt Gigantea juvenile. The bottom two could ultimately end up being Giantea or Haddoni, hard to tell at that size, but I'd bet on Gigs as well.
Images are from a Flickr user, forgot the name. I've had those pics saved from years ago for comparison when I was viewing juveniles in the wild.