Kim, you asked about the disc as far as id, I'll quote from Fautin and Allen (the anemone id gurus): "Tentacles [of H. malu] arise from brown or purplish (rarely bright green) oral disc as much as 200 mm in diameter that may have white radial makings evenly tapered to point or slightly inflated in middle; lower part same colour as oral disc, but upper portion may have several white rings or green end. Column very thin in expansion; upper part violet-brown (due to zooxanthellae) with longitudinal rows of adhesive verrucae. Anemones can retract completely into sediment; most common in shallow, quiet waters." Differences between H. crispa and H. malu: "In contrast to animals of the other three species [H. aurora, H. crispa, and M. doreensis] H. malu has relatively short tentacles, typically of variable length; tentacles of the other two species of Heteractis may also be magenta-tipped [like H. malu]. Tentacles of H. crispa may contract in the absence of a fish, but H. malu has fewer tentacles per radial row; tentacles of H. aurora may be similarly sparse, but have swellings at intervals."
After reading the descriptions and looking at the pics in the book, I would definitely lean toward H. malu.