HELP!!! dying fish

update

OK, here is the update.
We kidnapped, (not really), the aquarium guy and brought him to our house. He couldn't find anything wrong with the setup, or with the inhabitants, he took a water sample to test, and our new friend is a bicoloured blenny that he, (fishguy), acclimatized and put in our tank. So, four days from now, Saturday, is the D-day to see if it worked!! On a side note, he didnt' do anything else different in putting the fish in than we do so that is one potential error removed from the list.
Thanks for all the input and help, any more thoughts would be greatly appreciated as we still dont' know what is going on, especially if this one dies.. We shall see.. Any good books you guys have read on saltwater aquariums?
 
Actually, it could be that your damsel is the 'predator'. They are known to be a very territorial fish. There is a saying that if a damsel were as big as a shark, the shark would run in fear. Another saying is God made damsels only to sell to unsuspecting newbies. I also fell for the damsels in my tank. I did have a 20 set up with 3 damsels. A faulty powerhead took out 2 of them and I had to remove all the rock to get the 3rd one out. The reason I had to get that 1 out is that I could not add another fish without him killing him. Even if you don't see your damsel picking on the other fish he probably is when your not looking. Remember this is my opinion only.
 
I used to have alot of "bad luck" when I used purified tap water (just filtered). When I switched to RO/DI water I noticed an extreme improvement in everything in the tank (including my bad luck with pet deaths). Could be something maybe the fish cant handle but doesn't bother the inverts? I had damsels too with tap water and they NEVER showed signs of stress. Makes me think, has anyone lost say a yellow-tailed blue damsel because of bad water conditions? Seems like the **** things just dont die, but anyway its the only $0.02 I can give at the moment. :-/

Rick

EDIT: The purified tap water tested fine for the more common things, but i never tested for copper, phosphate, etc... only the general ammonia, nitrite, etc. Maybe a more extensive test? And I agree with the post above me, look to the damsel at least as a possibility. When I had mine they were terrors, worth checking into at least.
 
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Was considering the damsel aswell but the French angel and the Clown had No damage to any side of them or to there fins. the both were intact. As a side note with the french angel the damsel wouldnt even go close to him. He apeared to be afraid of him if the angel would swim to one side of the tank the damsel would go to the otherside.
Dan
 
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