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540 is very high and its why I will be changing salt. I am actually changing due to the high alk because I like to keep it at 8. From everything I have read a calcium level that high will not hurt anything.
I hope it all works out for you, but this is why I will never own a controller. Introducing a single point out failure is not something I would choose to do.
Just to clarify, he means to cover the tank with a blanket or similar so no light gets in, not to cover your reactor. Just wanted to make sure you were on the same page.