Should I be worried?

A bristle worm could not do it. They are scavengers not hunters. I would say purple lobster but its strange why now did he eat his tail? How long have they been in the tank together?

 

think what u want? Or how about i just think of what is factual, there was a thread on this before, bristle worms dont eat anything living, and anyways it would not be able to do that to a live fish with one bite....think about it, its impossible.....not even relistic

exactly

 

The name "bristleworm" is a label loosely applied to describe all Polychaete class marine worms, but it is members of the Fireworms Amphinomidae family that have earned the name of being what most aquarists consider to be "true" bristleworms.

Primarily it is the Pherecardia (Pacific), Hermodice (Caribbean), and other related species that one needs to be concerned about. These Fireworms are errant (roving) carnivores that can cause much damage in a reef tank. They bare toxic bristles on their bodies that can inflict a sting of a very painful degree, posses strong jaws for feeding, and can reproduce quite rapidly.

They are not selective about what they eat, but usually prey on all types of other motile (moving) and sessile (attached or stationary) invertebrates, such as corals, crustaceans, mollusks, sedentary type as well as other errant type bristleworms. Being particularly aggressive predators, they may even eat small fishes, if an opportunity presents itself.

 

THIS JUST IN !!!Killer Bristle worm on the loose ,lock u tank tops and stand back for further information

 

Ocean Paradise is right on this one. Bristleworms simply do not have the ability to catch, tear, bite or kill anything that is alive. They are purely scavengers and a great addition to anyones clean up crew.

 

so no killer bristle worm

 

haha,now that was funny!!

 

exactly like i said! Thanks phoenix, bwalker, saying that a bristle worm could do that is not making you look very smart lol there is zero percent chance that a bristle worm ate his moving fire fish and took a huge chunk out of his tail. Just thinking about it makes me LOL

 

I have to agree with Bwalker (although I probably would have stated it differently ), there are predatory "bristle" worms, the majority are scavengers but there are some that aren't.
http://reefkeeping.com/issues/2003-04/rs/index.php

That said I would think the lobster is probably a more likely culprit or maybe aggression from the new fish on the block.

 

lol a killer bristle worm