I am starting a saltwater tank and have had everything but fish and rock in the aquarium for around two weeks. On Friday, I received a shipment of live rock and introduced the rock to our tank (on Wednesday I had added three damsels). By noon today all the damsels were dead, so I went and took a water sample to our pet store and they said everything checked out fine. I purchased five more damsels and within fifteen minutes from entering the tank they were laying on the bottom of the tank. I know salt water tanks take time to cycle (we also purchased bio-spira and added it to our tank today to help with the cycling), but I am beginning to think maybe the rock was not a good thing????? Also, I noticed when I open the lid to our aquarium it is a little stinky. What should I do??? Thanks for the advice!!!