Looks to me like the climbing ammonia and nitrites in addition to the O2
depletion from adding mixing SW
and a sudden decrease in specific grvity was too much. It is not recommended that you cycle with live fish, there are much more humane ways to cycle a tank, I am disappointed that your LFS
hasn't informed you it is not necessary to cycle with damsels, they must be desperate for your 4 bucks per
Please read >>this article
<< for more details.
Did the forum let you know you were typing in all caps?? On the super information highway, typing in all caps is considered yelling 8O Thankyou for your consideration in this matter