Checking my math for DIY additives

[Exus]

I just got my ICP back with my Manganese at undetectable levels and Molybdenum at 0.104 ppb.

I want to dose 0.1 µg/L of Manganese daily and I want to increase my Molybdenum level by 15 µg/L.

My tank is 150 gallons (567.81 L).

For my daily Manganese dose, 567.81 L x 0.1 µg/L = 56.781 µg of Manganese daily.

If use Manganese Gluconate, which is 25mg Manganese per 225mg of Manganese Gluconate, I should use 511.029 µg (0.511 mg) of Manganese Gluconate daily.

For my molybdenum, 567.81 L x 15 µg/L = 8,517.16 µg = 8.517 mg of Molybdenum.

If I use Sodium Molybdate, which is 39.5% Molybdenum, I should use 21.562 mg of Sodium Molybdate.

Does this look right? I typically use Brightwell Replenish trace minerals daily and apparently they're formula doesn't include molybdenum. I know Replenish already has Manganese, but my Goniopora hasn't been looking too good, so I want to try increasing it further.

 

[Exus]

Bump

 

[JimWelsh]

Does this look right?

Yes. I checked your math, but not your assumptions about the relative amounts of the elements in the substances you are dosing. Your math is correct.

 

[Randy Holmes-Farley Verified Community Expert]

I just got my ICP back with my Manganese at undetectable levels and Molybdenum at 0.104 ppb.

I want to dose 0.1 µg/L of Manganese daily and I want to increase my Molybdenum level by 15 µg/L.

My tank is 150 gallons (567.81 L).

For my daily Manganese dose, 567.81 L x 0.1 µg/L = 56.781 µg of Manganese daily.

If use Manganese Gluconate, which is 25mg Manganese per 225mg of Manganese Gluconate, I should use 511.029 µg (0.511 mg) of Manganese Gluconate daily.

For my molybdenum, 567.81 L x 15 µg/L = 8,517.16 µg = 8.517 mg of Molybdenum.

If I use Sodium Molybdate, which is 39.5% Molybdenum, I should use 21.562 mg of Sodium Molybdate.

Does this look right? I typically use Brightwell Replenish trace minerals daily and apparently their formula doesn't include molybdenum. I know Replenish already has Manganese, but my Goniopora hasn't been looking too good, so I want to try increasing it further.

FWIW, there are many diy threads on these materials in this forum where dosing math and suitability of chemical forms is already worked out.

 

[Exus]

FWIW, there are many diy threads on these materials in this forum where dosing math and suitability of chemical forms is already worked out.

Thanks, just found the non-organic additive calculator. First time in the chemistry section of the forum.

 

[pj007]

Hello, i need help with this calculator. unfortunately I couldn't find it. I have a large aquarium and manganese consumption increases very quickly. finished products wear out quickly. I am currently using fauna marin manganese.

 

[Exus]

Hello, i need help with this calculator. unfortunately I couldn't find it. I have a large aquarium and manganese consumption increases very quickly. finished products wear out quickly. I am currently using fauna marin manganese.

You can use this calculator: https://rotalabutterfly.com/nutrient-calculator.php

But if you want to do it by hand or double check follow this -
Example:
"My tank is 150 gallons (567.81 L).
For my daily Manganese dose, 567.81 L x 0.1 µg/L = 56.781 µg of Manganese daily.
If use Manganese Gluconate, which is 25mg Manganese per 225mg of Manganese Gluconate, I should use 511.029 µg (0.511 mg) of Manganese Gluconate daily."

So you can just use the formula
System_Volume_L x Desired_Concentration = Dosage_Mn
Example: 567.81 L x 0.1 µg/L = 56.781 µg of Manganese

Then if you are also using Manganese Gluconate, then you do
Dosage_Mn x 9 = Dosage_Mn_Gluconate
Example: 56.781 µg x 9 = 511.029 µg = 0.511 mg of Manganese Gluconate

You multiple by 9 because 25mg Manganese per 225mg of Manganese Gluconate and 225mg/25mg = 9.