I had a similar issue where my mag was dropping insanely fast. I was dumping in 20 mls into a 40 gallon system daily. I later found out that the salt batch I was using only had a mag level of 1200ppm and leading to the drop in mag every time I changed water. My bottom floor is covered in coraline after correcting the new salt water, I use around 8mls a day, cal and alk consumption is roughly around 40-50ml a day once I have factored in kalk as well.
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