yes it is most likely a fireworm or bristleworm. to be properly identified it would need to be examined by someone knowledgable. there are quite a few species from the various reef locations, and not a lot is known about them yet. incase you havent already been warned, dont touch them... they arent called fireworms for nothing..! but they are helpful scavengers so no need to remove him.
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Hi Caroline, Thank-you for your information.I have just been on the internet looking for species of marine worms and found a picture of what ours looks like and it says its a Hawiian orange fireworm. It also states that it is a debris eater and good for the aquarium.(I hope). You can't touch this one either as it hurts!!!