Parameters

[Hoffer]

Sure, i assume you are using their reef advantage magnesium product. Plugging this into the calculator:

Means you need to add 3618.6 grams of their product to your tank to get from 1107ppm to 1400ppm. This would be best done following their advice of no more than 25 grams per 20 gallons, you *could add up to 325 grams per day, i would not add that much and take it a little slower.

Your 450ml container holds roughly 2 cups. They recommend 1 cup for each 25 grams, so mix 50 grams of powder in that container, and you can dose it full tilt 4-5 times per day, measuring your mag every other day until you hit 1400ppm. At that pace, (200grams per day) should take about 18 days.

Also from their page:
DO NOT OVERDOSE
Do not exceed 25 g/80 L (20 US gallons) per day. Excess magnesium may enhance the loss of carbonate alkalinity. Do not directly mix with any carbonate supplement. Best if magnesium & carbonate additives are added on alternate days or at least 30 minutes apart.

As always thank you. I have it set for 70 milliliters 4 times a day.

 

[Hoffer]

That lid isnt doing you any favors concerning low ph.
Action items recommended:
1. Increase air exchange, either with the skimmer or through some other means. This will start to help with ph.
2. Work on decreasing phosphates. GFO, lanthanum etc. Whichever method you choose is fine, just dont do it too rapidly. .4, .5 is fine for lps/softies, .1 is better for sps.
3. Dose mag back into the 1300-1400s.
4. Depending on alk consumption and current levels, implement kalk dosing to help with ph in parallel with increased gas exchange. Watch out that you dont swing your alk too high or to quickly.

That should keep you on track for a healthy tank.

So I need to raise calcium and ph. Alkalinity is good but has room to go up. Since the three are related I put kalkwasser calculator to raise calcium from 370 to 430. It said to use 7428ml in a day. So I divided that by 24 and it came up 291ml per hour. So I set the dosage at 150 an hour. How does that work. Starting to feel like a chemist. I can’t say it enough thank you for all you have done for me.

 

[Red_Beard]

So I need to raise calcium and ph. Alkalinity is good but has room to go up. Since the three are related I put kalkwasser calculator to raise calcium from 370 to 430. It said to use 7428ml in a day. So I divided that by 24 and it came up 291ml per hour. So I set the dosage at 150 an hour. How does that work. Starting to feel like a chemist. I can’t say it enough thank you for all you have done for me.

You are welcome! I think that sounds good.
Just remember to keep tabs on things you are actively dosing so if it changes faster or slower than you anticipated you catch it early. Sounds like you are on a good track!