For the future and the benefit of others here, I'd also like to add that it is best to ask an
LFS to hold a fish for you. Some will ask you to buy it first. Others will gladly do so if you have a good relationship with them.
During that "hold over", you should be spending time looking over the fish. Do you see any signs of Ich or any other parasite. Is the fish "plump" and healthy or is it emaciated? Ask them to feed the fish in front of you. If it does not eat, don't buy it.
Some fish just take forever to
acclimate properly. Tangs are notorious for "stressing" out and becoming ill or die. They are "ich magnets". Even after proper
acclimation, they sometimes get ich. They need PLENTY of swimming room and other requirements that if not met, cause them stress, and therefore lowered immunity and BANG.. trouble begins.
Also keep in mind that some fish are kept so long in transport, that they are starving to death. In some cases, unless they have live food, or if it is not "too late" to reverse the starvation, they will die.
Finally, there are STILL cyanide processes being used in the collection of fish. If your fish was caught by this method, it could have been doomed from the get go.
With all that said, I'd still be interested in seeing your set up and specs.
Dave
Yellow Tang Died.... 
USA 
to hear about your fish. That is a bummer. What are your parameters?
to TR.
icon under their name to add to their reputation. 
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