I noticed an extra long filament on the right side of a mille that I recently put in my tank. It is near the base of the coral and only seems to come out for a few minutes during peak lighting hours and doesn't seem to be irritating the coral. Could this be a hydroid or is this just an extra long PE? Any help would be greatly appreciated!
Single Long Filament on Millepora
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Dread Pirate Dave
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Hopefully it isn't a coral boring spionid worm. Others here will have a better idea though. 
I actually had a spinoid worm on one of the branches and ended up fragging it off. It looked like the post you linked with two antennae’s peeking out but the one pictured above is a single long filament that looks different from what I saw previously…hopefully it’s not another oneHopefully it isn't a coral boring spionid worm. Others here will have a better idea though.
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