I got this beauty at Aquatic Collection several months ago while perusing a very large selection of chalice & other LPS. When I bought it I thought it was a chalice, not sure the kind, but recently had Icon over who thought it could be an Australomussa. So out of curiosity I'm asking the experts which of the two it is? FWIW it does have nice sized feeding tentacles, is abou 6" across and as you can see doesn't grow flat like a disk.