I would say it is a pavona, as the leptoseris that we usually see in the hobby, L. mycetoceroides, has irregular folds with the corallites in between the folds. I also do not know of any leptoseris species that have a flat coenosteum. However, the only pavona species I know of that looks close to this coral is P. chiriquiensis, which occurs in the eastern pacific, where no stony corals are collected for the aquarium trade. Note that genetic analysis has shown that leptoseris and pavona, along with gardineroseris, are all polyphyletic and will probably be grouped into one genus in the future.