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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.
He is suggesting that the medication reduced the amount of good bacteria in your tank, which also could have caused your biopellets to not properly mature (not work).