ICP test results, need help

[bucfan]

Just ran an ICP test on one of my tanks. Some of my parameters were lower than expected compared to ocean water. K, Cl, Na, C, Co, Fe, I. See results attached. I do water changes every 2 weeks. My other tank has only Co, Fe, I off what is expected. What must I do? Do I need to dose anything? The tank with lower parameters is not doing well when it comes to growing corals hence I ran the test.

 

[Randy Holmes-Farley Verified Community Expert]

The salinity is low. That is why the major elements (sodium, chloride, potassium, magnesium, calcium), etc. are low.

I'd boost it.

How are you measuring it and what do you think it is?

 

[bucfan]

Salinity is 1.025. Measure it with Hanna meter.

 

[Randy Holmes-Farley Verified Community Expert]

I think it is closer to sg = 1.023. I'd recalibrate the Hanna and then raise the sg to 1.0264 (35 ppt). That will bring everything up.