Dosing Alk, Ca, and Mg?

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Hi guys, question about dosing elements in a FO/FOWLR tank. Is there any reason/benefit to dose Alk, Ca, or Mg in a FO/FOWLR tank? Eventually I’d like to add corals so I figured getting the parameters perfect now would be beneficial. Speaking of which, what parameters for those do you all recommend?
 

Humblefish

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I feel it's worthwhile to at least keep them within range.
  1. Alk: At least 7 dKH to help keep pH stable
  2. Calcium: 400ppm (fish benefit from calcium in the water)
  3. Mag: 1250-1350 ppm (to keep both Alk + Calcium in balance)
 

Pufferlover95

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I feel it's worthwhile to at least keep them within range.
  1. Alk: At least 7 dKH to help keep pH stable
  2. Calcium: 400ppm (fish benefit from calcium in the water)
  3. Mag: 1250-1350 ppm (to keep both Alk + Calcium in balance)
Do you have any thoughts as to why I can’t get my Ca above 300 even with dosing? I use Red Sea dosing and check parameters with Trident.

Alk is fine, Mg is low-normal, but Ca remains either under 300 or just above. But I don’t have coral so I don’t understand.
 

tehmadreefer

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Do you have any thoughts as to why I can’t get my Ca above 300 even with dosing? I use Red Sea dosing and check parameters with Trident.

Alk is fine, Mg is low-normal, but Ca remains either under 300 or just above. But I don’t have coral so I don’t understand.
Unless your ca is in the loan 100’s no cause for concern just as with all and mg. But it’s your tank and your wasted dollars lol
 

Humblefish

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Unless your ca is in the loan 100’s no cause for concern just as with all and mg. But it’s your tank and your wasted dollars lol
Some good reads below:


 

Pufferlover95

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What is the number?
F5DBFA8D-C2F6-4E25-836B-4998BB08379D.jpeg
 

Humblefish

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So I easily raised Mg to over 1300, but I still cannot bring my Ca up. What gives?
What are you using to raise calcium? You can dose Calcium Chloride to raise it 50 ppm per day until it reaches the desired level. I keep mine around 450 ppm.
 

Pufferlover95

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Have you repeated a calcium test with a different tester?
Which tester are you using?
Maybe the one you are using is not accurate.
I haven’t TBH. I’m using Trident to test all 3. I suppose I could use a different tester and see if the results are the same or not. But I don’t know why two out of the three tests would be accurate and one would not all from Trident
 

Humblefish

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I haven’t TBH. I’m using Trident to test all 3. I suppose I could use a different tester and see if the results are the same or not. But I don’t know why two out of the three tests would be accurate and one would not all from Trident
I’m gonna tag @OZ_SPS because I think he used trident ICP.

I use Fauna Marin to do my ICP tests. I don’t test Ca with a hobby test kit either. But I would use a hobby test kit if my ICP was out of range.
 

OZ_SPS

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So first, I do not trust trident especially with ca and Mag. Personally i would test mag and ca using a trusted home kit to confirm your base line.
Second, I personally do not think there is value of element dosing in a FO tank.
Water changes should be more thsn enough to mantain proper levels. Unless if the parameters are so out of wack, I do not think fish care. Now what is out of wack, this can be subjective
If you want to dial your paramaters, first start with trusted base line.
Then you can seek to eliminate issues while dosing.
One example is, when mag is very low, your ca and all consumption can slow down. Again, since this is FO, I do not know how can there be big consumption
Another example, some times rocks socks up and deposits CA. So it's possible you start seeing ca consumption but it's the rocks.

Here is the game plan I recommend

1- test using a trusted tester and compare to trident. I like salifert testers for mag, ca and alk.
2- report your paramaters values and let me know what you want to target (would be good to know why also)

Then let's talk. Do not dose too much now trying ti reach a value, let's make sure ur base line and your target value make sense.
 
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OZ_SPS

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Oh and if you are doing that to be ready for coral, then what matter is to know your current paramaters, then a good water change should put u in par with your selected dalt mix. Then you start from there, you add coral and test and adjust based on ir consumption which will increase as your coral lead increases.
 
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