The other day i went to the lfs to get premixed water for a pwc. I got 5# of LR also. I put the cured rock and the water into my tank and turned off the lights for the night. The next day my tank was cloudy and the corals(2) were not open. I checked the water parameters and all checked out great, so i figured in a couple days when the water cleared it would be ok. I did feed everything though. Yesterday nothing changed so i checked my water again, and again it was ok. Now i am worried, so i take some water to the lfs and they checked it,it checked good. I checked it for copper, and it showed "0", so i checked the alkilinity, it read blue(or it looked blue)I dont know much about alkilinity but read reefs like between 120-300ppm as a buffer, which should read green(darker green) Mine looked blue not green. Can you have to much alkiline? Anyway that was the only thing i found suspect, then i remembered the lady at the lfs gave me a empty stress coat 5gal. jug to put my water in and put my water in that instead of my 1 gal. water jugs. That draws a flag. Anyway, today nothing changed in my tank, so i went to the store and got RODI water, mixed in the salt, and took 5 gal. of water out of my tank. While checking my Rodi water i noticed all my fish(2 damsel,1 lawnmower blenny), and my pepermint shrimp were all swimming at the top of my tank almost trying to jump out. Aftrer a couple minutes they slowly fell onto their sides and fell to the tank.Looked like they all died.. I got the damsels out of the tank and put them in some left over fresh water, and went searching for the blenny. I foudn him laying upside down on a rock. I also found a bunch of copipods and/or amphipods laying all over the place. While trying to get the blenny i realized he was not dead yet, so i added my new water and a gal. of premixed water with stress coat. After a couple of min. my blenny went right side up, he was breathing heavy but right side up. My shrimp did the same thing, and my crabs started moving around. I checked the damsels and they were still breathing so i quarentined them in my tank incase they dont make it. Just checked on them, there still sitting there. Any ideas or suggestions on what else to do and check ?