Also...that^^
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My turn to jump in on this one.
There are colorful anemones in the ocean growing under the sun. If you look at the wysiwyg section on coral exporters weekly lists there are rainbows, lemon drop types et cetra. Even just ordering "normal" red bubble tips they come in red and and bi-color/rainbow. No one is sitting in Indonesia "color morphing" thousand of anemones before transhipping them to distributors across the world.
Now I do agree that anemones can morph colors a bit in our captive systems. I've been lucky enough to have gotten a couple that have turned out to be pretty nice that weren't that nice when I originally bought them. It's the same with coral as well or really anything containing zooxanthellae and pigments.