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Thanks. I’ve been literally afraid to dose my tank for this very reason. This incident has not helped my confidence. LolI think you’ll be fine
How bad is that it jumped 300ppm in 10 minutes ?You'll be fine! A lot of people (myself included) keep Mg in the 1400-1500ppm range and IMO you should strive to keep it at 1200+ one way or the other so you're right where you need to be!
Honestly not bad at all. Big jumps in alkalinity and calcium are what you need to worry about. Mag not so muchHow bad is that it jumped 300ppm in 10 minutes ?