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Can you keep your tank too stable?
First of all, there is a ton of misinformation and hyperbole in that video; some of it borders on comical. Corals are well adapted to sudden and rapid changes and well as gradual changes in temperature in the ocean. There is nothing stable about the temperature on an actual coral reef with temps often being very dynamic. If anything, maintaining exactly the same temp all the time might lower the thermal resistance and cause problems when there is a shift because of a problem. For years I've encouraged swings of a 2-3 degrees from day to night in all my reefs.
The incessantly preaching some do about stability in this hobby has little basis in reality. An alkalinity swing won't cause any real harm to corals if they're healthy and nutrients aren't dangerously low. I used to do water changes that would raise my alkalinty 1-2 dKH in my system with regularity. If my dKH gets low or high I make instant adjustments to get it back to where I want it. Quite frankly, telling everyone they need to make adjustments slowly and over the course of several days can also be dangerous. If a major parameter is in a zone where it could cause harm it's typically best to get it adjusted quickly, because long-term exposure to bad parameters is often far worse than any stress caused by getting the parameter back in line.
I'd bet money that the person in the video does carbon dosing in some form and bottomed out a nutrient and that's what caused the damage. Zero chance that a temp (within 75-85f) or alkalinity fluctuation would cause that. Or, the lighting theory mentioned in this thread is also more likely than any of the things he thought might be the issue.
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