Hi, got a new invert rock a few months back and all was well-- until this beast started crawling around! I seem to have also lost a colony of Zs that were on the rock he crawled out of. Can anyone ID this guy-- he's BIG, about 6-7 inches long and pretty thick around-- like a simple bristle worm but much bigger and much thicker--

I also get what you're saying in that the 'names' are interchangeable until you start to apply actual names to them ( latin). I'd like to stress that I know the common bristle worm we all have and see about as often as you see damsels at the retail store! And I've seen usual size bristle worms with their pinkish white bodies and tuffs. And I've seen some impressive specimens in terms of size relative to the typical sized ones. But even with all my years in the hobby and aquariums and collected species too numerous to count, over that time, I have NEVER seen one like this-- I mean an IMPRESSIVE animal and the word 'worm' just seems to not do it! LOLs, its gone 'to ground' since the last sighting ( I've only seen him twice and the suspect live invert rock which came from a wholesaler is four to six months in the tank) I placed two traps in the tank and I will keep alert as the last two sightings were between 8-9 at night. just disturbing that the z's on that purchased rock and now two of my blue mushrooms have disappeared. meanwhile all other mushrooms seem fine. a mystery. when I catch him, I get some good photos and we can maybe ID it at that point. It is kinda cool and also kinda creepy all at the same time-- I'd say about 8-9 inches long and thick around as a large cigar.

