Magnesium and coral issue

[Jr'sReef]

I’ve noticed that every time I add magnesium (brs pharma) my corals especially the Zoas (not all) seem to become unhappy. My mag is at about 1300 really want it at 1350-1375 but I don’t want to stress things out even more. I dumped my first batch of Mg ordered an new one and same issue. I don’t go over the recommended dosage at all. Maybe a 20-25ppm dose and everything gets ticked. Anyone have similar issues?

Only happens when I dose Mg

 

[Reeferdood]

How many ml are you adding at once and how big is your system?

 

[Waters]

No, I have never experienced that.....I actually add Mg to my water change salt weekly without any issues. What type are you using and how much are you dosing?

 

[KrisReef]

Thinking about your post: What test kit are you measuring Mg with? If you are getting negative results from the livestock I might suspect that the levels in the tank are not in line with what your kit is giving.
Hth.

 

[Jr'sReef]

Salifert test kit
400 gallon DT
420 calcium
9.5DKH
1300Mag
1.023salinity
8.15ph

 

[Jr'sReef]

I add about 500mls, I put 250 mls slowly into the overflow in the afternoon and then 250 mls slowly into the overflow before lights out. This should only raise it maybe 20ppm am I doing something wrong?

 

[KrisReef]

I add about 500mls, I put 250 mls slowly into the overflow in the afternoon and then 250 mls slowly into the overflow before lights out. This should only raise it maybe 20ppm am I doing something wrong?

I don't see that you are doing anything "wrong." I've added Mg much faster (greater overall Mg increase/addition) and not had any issues. I do drip my solutions into the sump (vs pouring slowly into the overflow), but our methods seem fairly similar. Since you are seeing problems, I wondered if your Mg levels you reported might be off? Salifert is generally a reliable Mg test brand. I was wondering if your levels were actually much higher than ~1300, then perhaps you would expect the poor results you are reporting with your addition? This is still a mystery...

 

[sghera64]

I’ve noticed that every time I add magnesium (brs pharma) my corals especially the Zoas (not all) seem to become unhappy. My mag is at about 1300 really want it at 1350-1375 but I don’t want to stress things out even more. I dumped my first batch of Mg ordered an new one and same issue. I don’t go over the recommended dosage at all. Maybe a 20-25ppm dose and everything gets ******. Anyone have similar issues?

Only happens when I dose Mg

What is your source of magnesium?

Some sources have impurities which might explain the effect you see.

 

[Jr'sReef]

I’m using BRS pharma grade. I am though having issues with it dissolving completely. Haven’t had my last two batches mix 100% clear. They seem to leave a fair amount of precipitation but I only dose the clear part of the gallon. (I mix it according to the instructions)

 

[mtraylor]

There is a chemical reaction when adding magnesium and it causes heat as well so it should be completely dissolved or put in an area like in sump way away from display.

 

[Jr'sReef]

I just purchased a new gallon of BRS Magnesium Mix. I think I may record myself making the gallon batch. Even though it’s pretty straight forward. I may just add little by little and stirring while I keep adding.

The whole add all the mix and add 3/4 RODI shake and then top off isn’t working.