Drop checker clear? - The Planted Tank Forum
 
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post #1 of 8 (permalink) Old 01-28-2014, 12:47 PM Thread Starter
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Drop checker clear?

I recently installed a pressurized CO2 system and my drop checker before was always blue. Now it seems to go green then just clear. It doesn't appear to be leaking but I think I heard of others having problems seeing the color. Is a drop checker the best way to test CO2 levels? Or is the calculator a better idea?
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post #2 of 8 (permalink) Old 01-28-2014, 01:50 PM
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are there fish in the tank?


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There are 2 types of people on this forum. Those that have algae, and those that lie and say they don't.
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post #3 of 8 (permalink) Old 01-28-2014, 01:51 PM
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It's probably turning yellow. Try using a drop or two more of the indicator solution (pH test kit bromothymol blue).


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post #4 of 8 (permalink) Old 01-28-2014, 02:04 PM
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Quote:
Originally Posted by xmas_one View Post
It's probably turning yellow. Try using a drop or two more of the indicator solution (pH test kit bromothymol blue).
+1 If it's blue and green you just don't have enough reagent to see the yellow.
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post #5 of 8 (permalink) Old 01-28-2014, 02:11 PM
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How long have you kept on using the 4 dkH reference solution and bromothymol blue? I find that after some time, that the colour no longer reliably changes; I am not sure if this is due to degradation of the indicator (it might be completely wrong, but I am not an organic chemist )

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post #6 of 8 (permalink) Old 01-28-2014, 02:15 PM
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that is what i was getting at as well. its probably going beyond yellow, or just PALE yellow it appears clear.

but the fish will tell you that co2 lvl as well


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There are 2 types of people on this forum. Those that have algae, and those that lie and say they don't.
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post #7 of 8 (permalink) Old 01-28-2014, 05:42 PM
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Drop checkers are a rough guide to CO2 levels. a pH monitor would probably be more accurate, and more expensive. I think ultimately, your fish are the best indicators. As long as they are alive!
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post #8 of 8 (permalink) Old 01-28-2014, 08:51 PM Thread Starter
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Yes the fish are alive and doing well. Thanks for the replies. Probably is just yellow. I have changed it every two two weeks as recommended, but still results clear after CO2 installation. By the calculator I'm at 28 ppm so I should be in good range. Thanks again
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