Low magnesium makes abiotic precipitation of calcium carbonate on heaters, pumps, etc. faster, making it harder to maintain calcium and alkalinity, especially if the pH is also on the high side.
I recommend magnesium to be 1250 to 1350 ppm,so I'd boost it with MG flake or a commercial supplement from Kent or ESV. For this small of a correction once, you can likely just use Epsom salts from the grocery store.
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.