Thanks sonofgaladriel.
It is impossible to be 100% certain from that pic, but I would say that it is a gigantea for a couple reasons.
The inside tentacles are in rows. This indicates a less than vibrant gigantea.
Mertens, IME don't form their edges into waves like the picture, even when in a bare tank.
The tentacles are pointy.
The denser tentacles near the edge are more in line with gigantea.
The wholesalers down here (Los Angeles) just got flooded(well not exactly flooded, but there were quite a few) with green, blue and purple giganteas early this week.
For those reason I am saying gigantea and not one in a condition that I would want shipped to me.