Incidentally I am about to try a sargassum filefish for majano/aiptasia control in my smaller tank but I am reading mixed reviews as to what might happen after they're all gone. But that's another fish you may wish to look into, apparently they looooove little anemones.
That might be an idea. Or a swarm of camel shrimp...
Ya, Shelley, the purple things are those clove polyps, they've sprung up everywhere!