The Gigantea at Waikiki Aquarium hardly have any flow at all. I could not believe it when I see a tape of it. Definitely the idea that Gigantea must have high flow need to be change.
In the past trying everything to keep these guys alive lead us to try high flow. The only one survived in captivity long term that I know about were in high flow tanks, in Rod Buehler's system. I think that was why we, at least I, think that they needs tons of flow. I never drove in the Pacific, other than in Hawaii, so never seen any of the host anemones in the wild first hand.