It only does this at night after the lights have gone out (like in the photo). Do gorgonians have sweeper tentacles? That's kind of what it looks like (though I don't have any corals with sweepers).
Oh, that does look like it. I guess it's showing up in that spot because there is really good flow there for a filter feeder. Thanks for sharing the link! This is useful for identifying other things as well.
Just wanted to share this article that appeared recently--interestingly, right after I found out I had a comb jelly in my aquarium. Apparently, they are of great interest to the world of science.
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