Found this sucker in my tank. It's like 2" long, it's segmented, hard like a crabs leg. It has a crown of sorts like a duster. Not even sure where it came from.
Do you have a big coco worm or feather duster that isn't where he normally is? I think that's him. Mine ejected it's crown when I crashed my tank and then a few days later I found something like tharecovered. It might also be a mangrove root from your live sand. Lol