Magnesium won't budge

OPtasia

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Hello all.

In my efforts to create a little more stability in a 32 gallon tank that's prone to neglect, i've recently (a week ago) switched to 3 part original balling method style dosing using Tropic Marin's 3 part liquid A, B & C.. My thoughts are this will help bring more stability to the salinity and remineralization in a tank that occasionally gets neglected. Since we can't all afford to put an apex and a trident on a biocube, I'm trying to target numbers in middle-ish ranges for a mixed reef tank. My numbers are holding steady at around 400 calcium, 8.5 dKH and 1200 magnesium. Pretty good except for the magnesium level that just will not budge. I've been doing daily doses of around 90 ml. of part C, which is about half the recommended maximum dosage Tropic Marin recommends for a 30 gallon tank. I add it. I add it. I add a little more and it just will not budge. My red sea kit shows it at 1200-1210. Ideally, i'd like to have it at 1300 to 1350.

Also, my LPS and soft corals really really hate the change in water parameters. That's been preventing me from doing the maximum recommended dose, because the softies and LPS seem to be reacting poorly having adapted to lower mineral tank water. I'm hoping they can adapt to the parameters changes if they've grown accustomed to crappy water parameters.

Is there anybody that can take a step back and look at what i'm doing? Here's the rest of the tank numbers: Ammonia 0, nitrite 0, nitrate somewhere between 2-5 ppm, phosphates undetectable on salifert kit.
 
Balling Part C is probably not the best way to boost magnesium. It has lots of other things too. You need a magnesium supplement for that.

However you do it, use a calculator and expect to dose a huge amount.
 
Randy, thanks for helping me figure this out.

Considering the corals look stressed out, would you recommend a water change or no? I certainly don't want to stress them out any more than they already are but my other parameters all appear to be on the money.

I'm using RO water with Red Sea Coral Pro salt and mix it to 1.025 for water change water. I haven't been testing the fresh saltwater, just relying on what Red Sea says the parameters should be based on the salinity level when mixed in zero TDS RO/DI water. Typically, i've been mixing it to 1.025 without testing parameters before it went into the tank.

As far as balling method and part C is concerned, it was my mis-understanding that part C was mostly magnesium salts with trace elements added to it. I assumed it could be used like a magnesium supplement but I guess I was wrong.

I think my plan will be to do as you suggest and just add a liquid magnesium supplement to it (say Aquavitro Ions, etc.) and get the magnesium levels up.
 
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It will be mostly magnesium sulfate and possibly chloride, but has other major ions such as potassium, bromide, boron, strontium, etc. it would work, but a magnesium supplement might be cheaper and won’t raise these as much.
 
I'm thinking you're right. The best approach is going to be to not change the water and use a magnesium only supplement like Aqua Vitro ions magnesium supplement to get the magnesium up to 1300. The corals are stressed and I need to give them time to adjust to the new parameters.

That, or they're telling me i'm severely overdosing them on the extra trace elements in the part C.

I don't know which. However I do know that once I get the parameters where I want them i'm going to do my best to keep them there.
 

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