Magnesium issue

[Reef-Geek]

Originally Posted by Myka

What's the volume of your tank? Which salt are you using?

For example; IO is around 1100 ppm, so every time you do a water change you're going backwards unless you add Mg to the freshly mixed saltwater.

IO is only 1100ppm still? based on my test it's around 1200ppm, based on my expired Salifert anyway.