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I have a 30g tank at the office with CO2 injection (no bubble counter), after the reactor I have a T with 2 needle valves one goes to a 10g tank and one to 30g.
Today, after I tested the water I got
Ph 6.4-6.6
Kh 15ppm
Gh 8ppm
in 30g tank and
Ph 6.4-6.6
Kh 9ppm
Gh 5ppm
in 10g tank.
It looks like I got 179ppm CO2 in my 30g tank(maybe I have that much).
My question is: Kh is really showing me the exact amount of CO2 or it is something else to.

Thank you

I forgot to mention this was the first time when I test the water since I start the CO2 injection 3 weeks ago.

Hmm, Sounds like something wierd is going on. Have you added any products to the tanks which modify the pH, or KH?

These can mess up your calculations.

Chaos

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- - - Humorous Bit of Wisdom - - -

Usually I do 50% WC every week and use Flourish Comprehensive Supplement for the Planted Aquarium (0.7-0.001-0.37).
Two days ago I dose 2.5mL of a solution made it my self from 600mL of water and 4tsp of K2SO4 (potassium sulfate)

There's something wrong with the way you report your numbers. KH and Gh can be measured in PPM or degrees of hardness.

For example 1 dgh is about 17.9 ppm .

If I read your numbers you have ZERO GH and KH

Unless you've mis-typed and the numbers you give are actually degrees not ppm.

If the water source is the same the KH should be the same in both tanks unless you are adding some kind of buffers.

Something is wrong somewhere, the easiest way to tell if you actually had 179ppm of Co2 would be to count the dead fish floating on the surface

Assuming the fish are ok, you've messed up the tests somewhere along the line

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Some days you're the pigeon and some days you're the statue.

Remember that age and treachery will always triumph over youth and ability.

Yep Ben, you are right is hardness degrees no ppm. Thank you for open my eyes
Everybody in my tanks are very happy no dead fish (the only thing bother me right now is Staghorn algae in 30g and Brown algae (diatoms)in 10g tank).
I never use any kind of buffers in my tanks.
The water i use is like bottled water we are buying from the store (I'm working for a ice company and I use the filtered water we use to make the ice).
It is the same water in both tanks.
With this test kit (KH/GH Test Nutrafin from Hagen) I use to test the water at home for my 10g tank (DIY CO2 changed every week) and usually I have KH 70-80ppm with Ph 6.6-6.8.

In this case (30g tank) CO2 63.3ppm is not too much?

Thank you

Not sure how you are doing the calculations

70-80ppm of KH = 4-4.5o. With a pH of 6.6 - 6.8 this gives you 20-30ppm of Co2. Or as we say in the trade "just right"

OR is that just for the home tank ?

If you are using filtered water at the office is it similar to RO water ?
If so you'll need to add GH and KH. GH is cAlcium and Magnesium which the plants need. KH to buffer the CO2.

Seachems Equilibrium should do both.

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Some days you're the pigeon and some days you're the statue.

Remember that age and treachery will always triumph over youth and ability.