I agree that DD ID is typically very accurate and I am certainly far from sure that this is a true gigantea, however, this is no ordinary haddoni. Tentacles are far too long; tentacle spacing resembles that of a gig and the posture/folding is very gig-like. Also, DD described the base and foot of the anemone as follows: "underside of the oral disc is purple, with a smooth purple/tan column and blue pedal disc." A blue pedal disk strongly suggests gigantea. Also, the diameter of the pedal disk is described as 3 1/4'', while the oral disk is described as 8 1/2'' - the proportionately narrow foot is highly suggestive of gigantea.