Pondering my kH/Co2/pH balance - The Planted Tank Forum
 
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post #1 of 8 (permalink) Old 10-27-2015, 01:09 AM Thread Starter
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Pondering my kH/Co2/pH balance

Okie dokie <--- Yes I'm a dad.

Tank Params
105q
- Orphek Atlantik 18 inches above water. Par at substrate in middle of tank 130. Par at corners 20. Currently running only 8 hours to keep algae at bay since the tank has only been set for 1 month.
- Mr. Aqua 500 & ADA ES-1200 both running from the same side directing flow over to Vuppa-1 surface extractor.
- 5lb Co2 running with customary glass diffuser. Soon to be replaced with an inline for better Co2 efficiency. Apex turns the Co2 on 1hr before lights are on and turns Co2 off when lights go off.
- Just started dosing PPS-Pro this week. Starting with half the recommended dosage(5ml).
I use RO/DI water for water changes and adjust gH & kH with Equilibrium & Baking Soda respectively...attempting to stay in the 4 range

kH = 5
gH = 5
pH reaches ~7.2 by morning with lights and Co2 off.

So here is my first question.

I do have a Co2 drop checker with indicator solution that only gives the right color(green) when I use enough Co2 that my pH reaches 6.2. My understanding, according to the Barrreport CO2/pH/KH table is that 6.2 should be too high of Co2 concentration. I should be shooting for somewhere in the 6.8 range. But I get no pearling at that level.

Throw out the chart and go with what the plants and drop checker say?
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post #2 of 8 (permalink) Old 10-27-2015, 01:24 AM
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You are getting a 1 unit drop in the pH. (from 7.2 to 6.2) This is correct for 30ppm CO2.

If the fish are happy, keep on doing this.
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post #3 of 8 (permalink) Old 10-27-2015, 03:28 AM
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Unless there's a lot of surface agitation, overnight probably isn't enough time to ascertain the pH level of the water with CO2 at equilibrium with the atmosphere.

So it's probably more like a 1.2 pH drop.

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Originally Posted by Diana View Post
If the fish are happy, keep on doing this.

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post #4 of 8 (permalink) Old 10-27-2015, 05:22 PM Thread Starter
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I thought that might be the response. It irritates me a bit because what is the point of those charts if they can't be somewhat of a reliable guideline.
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post #5 of 8 (permalink) Old 10-27-2015, 05:40 PM
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Quote:
Originally Posted by Bainreese View Post
I thought that might be the response. It irritates me a bit because what is the point of those charts if they can't be somewhat of a reliable guideline.
The chart does work but in a controlled environment like a drop checker.


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post #6 of 8 (permalink) Old 10-27-2015, 05:41 PM Thread Starter
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Originally Posted by Audionut View Post
Unless there's a lot of surface agitation, overnight probably isn't enough time to ascertain the pH level of the water with CO2 at equilibrium with the atmosphere.

So it's probably more like a 1.2 pH drop.
I would say my surface agitation is moderate. I have two canister filters on the tank. There are no bubbles to drive the Co2 out unnecessarily, but both canisters create a good amount of turbulance at the water level across almost the entirety of the surface.

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Originally Posted by mistergreen View Post
The chart does work but in a controlled environment like a drop checker.
So theoretically my drop checker should be showing green at 6.8 but doesn't unless the water hits 6.2.
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post #7 of 8 (permalink) Old 10-27-2015, 11:28 PM
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You should use a solution of 7pH 4dkH or some known dKH in your drop checker. Don't use aquarium water.


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Last edited by mistergreen; 10-28-2015 at 03:39 AM.
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post #8 of 8 (permalink) Old 10-28-2015, 02:22 AM
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Originally Posted by Bainreese View Post
I thought that might be the response. It irritates me a bit because what is the point of those charts if they can't be somewhat of a reliable guideline.
The issue isn't with the chart.

You KH test kit measures KH, but other stuff also.

Feel free to edit.
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