Hello,
Depending on your tank, you don’t wanna just blast it with any swing of elements. In terms of adding mag start with the lowest dosage and work up. Alk and calcium definitely should be more important of the three, (but yes mag is important). Corals can handle small swings, but not large, the same is true with alk and corals. (Depending on the tank because each is different), but corals will react less to a lower alk than if it goes too high like 10 plus. Same if calcium is low, add it daily and keep testing it, where it stabilizes. In addition it’s not uncommon for corals to respond to negative affects a few weeks after they happen.
Not to mention of your salinity is 1.024 which average is 1.025 going up to 1.026 will raise the mag faster and like 100ppm. However can your corals handle the swing from 1.024 to 1.026, plus all the other adjustments? It’s generally not ideal to make a rash of changes. If it goes south there are too many variables at play and now you really don’t know what’s out of whack.
In terms of this you see your tank daily, what are the corals doing? Are they happy, mad, dead etc? If the corals are nice and happy make the changes slowly. Dropping this much magnesium in at once is not ideal. I usually shoot for 1390 magnesium, and I was at 1240. I used Red Sea magnesium (liquid form) and I started with 20ml for my 240 gallon tank. Then the next day went to 30ml, then 40, and then 50. I tested after four days of adding, and was right at 1400 which then I stopped. Normally magnesium should be close to 1350 for a mixed reef and 1390 roughly for sps only.
What size is your tank (oh sorry it’s 125) or water volume and is it a mixed reef, sps only etc? Pics would help a lot as well, and what others have said raise the mag is faster by adding new salt water, but what else is going up as well?
