My blog a few days ago detailed how some corals and anemones were distressed, while other livestock seemed fine. I learned a few things that day when I tried to restore the lack of alkalinity in the system, which is great. I think more personal reefs suffer from alkalinity swings than most realize. Sure, accidents happen and excess solutions pump into the tank non-stop to the point that the livestock has little chance of survival. Some tanks overheat, others literally catch fire, ...