Well three fish dead, puffer, clown, and tang. My readings came back 0. MY ph was 8.1, my salt density was 1.24. the temp of the tank is 77 on both sides. I have two power heads and a big emperor filter. I do water changes ever 2 to 3 weeks, small ones. And last night I added Green-X to the tank which is lr friendly. Now all thats left is clean up crew and damsiles. Now, I just wait it out, and have no clue what affected the tank.