Is it possible to get a clearer photo? I'm probably wrong, but from the pic you posted it may not be a brislteworm, but a peanut worm. I've seen the odd bristleworm during the day in my system, have also seen my cleaner shrimp yank a small one & eat it. Since you mention you see these primarily at night is why I think it might be peanut worm. I see a number of these extend from their hole at night, more so than bristleworms. It that's what it turns out to be, they are definitely harmless.
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