Wow...that's crazy. If it ever happens again then try to bring it back down a little slower..a 2.5 swing up and then back down in 3 days can be brutal for coral. It's definately a no no for sps but I'm not sure the effects on lps. Sps takes about 4-5 days to see the results though. Glad you caught it!I dunno i even tested twice. I was testing daily beforehand and keeping it between 8.4 and 8.8. Added reef flux and the next day came home and saw several unhappy corals and one blasto that was half white skeleton ( it was nice and fluffy the evening before). Checked the alk and it was 11.2. Then tested again to double check because i thought i goofed the test up. Stopped dosing for 3 days and it came back down to 8.9.