So I’ve seen numerous threads where someone posts a picture of a bristle worm and asks if it’s a fireworm. I’ve responded to one or two with my opinion, “bristle worm”. You see the same reply often; that true fireworms are pretty rare these days, and that seems to be true. It seems most people who think they have a fireworm just have a large bristle worm. In one of those responses, I added a picture of a big bristle worm I see frequently. It’s been having me doing triple takes every time I see it, since the first time I saw it. After I just watched it come out of the rocks at the end of my ramp down and steal a pellet away from a hermit crab, I’m just not really sure anymore. It looks just like the rest of the little ones, of which there are plenty. I know that the red fill tufts are characteristic of fireworms, but as far as I can tell some bristle worms have them too and they might become more noticeable as the worm grows. At least some of the small worms seem to also have red tufts. All of them seem to be the same color. I understand better now, why this question comes up so often. Forgive the picture quality here, iPhone with flash on and tank lights out. Here’s the ugly truth.. (turn volume off probably)