I have 5 snails and a conch for clean up crew. I did a 20 day acclimation starting at 50% and the issue came about at the end of the acclimation. I just reduced the lights by 30% to see if that helps. If you look at my other post however I think it is dyingYou're getting into the ugly phase, it's part of the process. What's your cleanup crew situation?
What % did you start the acclimation at and how many days did you run it? Did you notice the coral issues after or towards the end of acclimation? If so...that could be the smoking gun.