Mg and SG

[Doug]

Originally Posted by hillegom

Doug, what brand of salt do you use? How much Mg and how much Ca do you add to 5 gals?
Thanks

Instant Ocean.

I broke this down from what Ben, {chemmaster}, figured for his large mixing tub.

23g mix,
150ml magnesium
3tsp calcium

Add to fresh water and mix for a few hours, {originally overnight but found a few hours works as well}, then add salt mix.

So far when following this my magnesium has stayed at app. 1400ppm. No need for additional. I change 5g/week on my 30g, and when it WAS sps. I usually drip kalk when I get around to it, but that was the only other calcium source and mine stays at 420ppm. I followed a similar tactic on my 90g with still 5g water changes, when my sps actually did grow. I will do the same for my 30g sps cube I,m currently working on.

I imagine a tank full of sps, clams and coralline, all consuming calcium would need additional calcium supplement but I,m hoping only kalk will do the job.

5g mix, {mine},
37ml magnesium
3/4tsp calcium

Follow same mixing procedure.