WOWWW i added the 5 blue chromis yesterday afternoon at around 3pm and woke up this morning to two dead and the other 3 are definately still fighting so im probably gonna lose more, im glad they are only 5$ a piece but still it sucks to have already lost 2!!!!
Very sorry to hear it. That is not typical for healthy fish, despite their tendency to bicker.
What are your water parameters? What was the acclimation routine yesterday?
How do the tanks and fish look at the LFS? How did the chromis look in the store? Any signs of stress, like heavy breathing?
I believe it is more likely that these fish were overly stressed, and the displays of aggression were/are worse because of it.
The top suspects would be initial capture and transport, acclimation or water quality at the LFS, or more of the same when brought them yesterday.
Once a fish starts showing signs of stress, the others will go after it.
Make sure the remaining fish are well fed, check all of your water parameters, and make sure they have ample hiding places.
I hope you have better luck moving forward.