fish stress?

Hello,

I have a tank that has cycled once, and I put four new damsels in
(there are three others in already and they are happy). I brought them
home, and they were in trouble it seems, as soon as they hit the water.
They appear to be gasping at the surface for breath, and their colour
has changed to an unhealthy dark. I took all my levels, Amonia, Nitrite
and Nitrate at 0 (as far as my test kit reads), and PH was about 7.9.
Salinity was perfect. So I am really curious as to why these fish have
died? The only thing I can think is that this is stress. Is that
possible? Ideas/comments more than welcome!

S.


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