@Great Argus This was signed as such by the aquarium, I'm not that well verse with cnidarians so I just go with it. Pictures online does resemble this specimen, but I'd like further identification.
@Rizz Carlton My best guess is some sort of Amplexidiscus (Giant Cup Mushroom) - there's a number of very similar looking images online. Bit tricky to sort them out though. Any Stichodactyla wouldn't have tentacles that close to the mouth, they all have a bare ring around the mouth.
@Great Argus Reading my notes and gallery again, I think the aquarium do have some corals signed as amplexidiscus fenestrafer. Though they look pretty different from the one in this picture.
