The part of the fish that is missing isn't anything to be really concerned with! If it were its body then there is more reason to worry as you don't want infections or rot to take place.
Did you purchase the two of them together? What other fish do you have?
If those are your first two fish, try buying another fish to try and distract the dominant Dwarf. That may work! If not you may have to make a decision on returning one of them!
Alot of times, saltwater and Africans included, can not be housed as two of the same species of fish due to this result of aggression!!! They say to buy one or three or more! However, this doesn't always work either...It is a a trial and error process alot of times!!!
Let us know your decision!
Good luck! again welcome to 3reef! _________ 125gal.w/Mag9.5 return(dual megaflow)>Mag7 pump Aqua Cev180skimmer.Wave2k Hamilton Reefstar(2)250watthqi(mh)pend.a Yellow, Naso Tang Red Lip Blenny Percula Clown Demoiselles Niger Trigger F. Wrasses Ceriantharia Orn.Shrimp and Stars Hermits Queen Conch asst. snails> Stars Zoos shrooms Montipora Brains Gorgonians Favia Turbinaria(large+small polyp) Acropora Xenia Tridacna (CroceaMaximaSquamosa) Leathers <35+75gal.reef tank as well>
"IF THE PHONE DOESN'T RING...IT'S ME"  jb |