A couple questions before answering your question...Has you tank fully cycled? Did you add all three fish at the same time?
Now, to start off Velvet Damsels are considered one of the most aggressive of the Damsels. Dart/firefish are very timid requiring peaceful non aggressive fish for their success and survival. This being said, I would definitely get rid of the Damsel. Really, if you like Damsels enough to have with non aggressive fish and in a reef environment, I would go with Yellowtails and Chromis', either Blue and/or Green!
To help you out, research the particular fish before choosing. Many fish are not compatible with each other or in a reef tank or with inverts etc.
This is basically my own opinion and for what it is worth, Velvets are a very beautiful Damsel but come with an attitude and a territory problem! _________ 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  | 
Bad mix????????????????????? 
