how hgih is to high on magnesium


New member
It's hard to say, given most references don't ever go into it, but 1500 ppm won't be a problem.


New member
Agree,I've had mine up past 1550 ppm with no issues.

*It's been mentioned a few times that elevated MG can help combat Bryopsis.
Oceanic salt mix has very high mag levels.

Per Billy's tests it has a mag level around 1650 ppm at a salinity of 1.0264. Hobbyists use this mix without problems. ;)