All(todas) test kits measure total(toda) alkalinity, not(no) Carbonate alkalinty.

Other chemicals and electric current can affect pH readings, (meters are affected by electrical currents). Acids such as tannins might not influence KH, but(pero) may influence pH. These are not due to CO2 so that may skew the results.

Regards,
Tom Barr

Thanks Tom for your explanations!!
Now then the only thing that I must do is a solution with kh4 and with a test of co2 to work her into the tank, with this I find out if I have good concentration of co2, the truth that he seems very simple.

If result is not much of a co2, I suppose that it is not good to take down the ph underneath 6.2, the solution pannier raiseeing the kh with smelling salts, is this right?
Thanks.

Pretty much.

I'd just try lowering the pH very slowly and seeing the effect on plants and fish.
You need to be careful and watch this

Do not go to work and leave the higher CO2 in the aquarium.

Also, if you use the translating engine to go from Spanish to English, you can take the English translation and try and translate it back again into Spanish.

Then you see how it reads to us

But if you use simple sentenace structures and and nouns, it works better.

Several folks thought I spoke Italian and German. Perhaps the translating engines will improve and use cross checking methods like this in the software in the future.

Then we could have universal translating engines for communication like on Star Trek.

Regards,
Tom Barr