Ph dropping like a kamakazi.... - The Planted Tank Forum
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post #1 of 6 (permalink) Old 11-15-2004, 08:02 AM Thread Starter
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Ph dropping like a kamakazi....

anyone experience a dramatic drop after adding CO2 DIY bottle to your tank? i swear i check the ph the other day and it's 7.0. then i just added (my first) 2 DIY C02 coke bottle to the tank this morning now it dropped to 6.2...i did add 1- 1/2 teaspoon of baking soda like 10minutes ago, after looking at the fishs stressing out. i never knew that it will drop that much. i check the kh, i believed it's 2dkh. unless i tested it wrong. i know it's normal for the ph to drop at nite. but that's a whole lot. how much baking soda would you add to your tank? and how long does that last for the next dose?
i believed the reason is because too much C02 caused the ph to drop. please confirm if you notice the same situation.
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post #2 of 6 (permalink) Old 11-15-2004, 09:19 AM
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It means your DIY CO2 is really working. 2dKH(when the test reads 2, it is really anywhere between 1 and 2) is not a lot of buffer, you might want to add more baking soda to get to around 4dKH. Anyway, 2 bottles on a 10g might be an overkill, watch your fish carefully. You might have to remove one bottle.

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post #3 of 6 (permalink) Old 11-15-2004, 01:29 PM
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CO2 will cause the pH to drop. It's the nature of the beast. With a pH of 7 I would say that your water had NO kH before you added the baking soda. I suggest you take a minute and read the water chemistry section of my Guide (and the linked sites) before you go on.

Normally one would not want to inject CO2 into a tank without having a kH of at least three to prevent pH crash.

You added 1 teaspoons of baking soda to what I assume is a 55 gallon tank. That would bring your kH up to just over 1 which with most kH test kits would lead you to THINK you had 2.

Baking soda in the tank doesn't wear out in normal use. But if you have a very low kH and don't do frequent water changes and add more baking soda to increase the kH of the changed water then you can lose all the kH you have added.
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post #4 of 6 (permalink) Old 11-15-2004, 10:40 PM Thread Starter
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thanks all, i appreciated for your help. let me go check my ph and kh again. then i will dose some bakin soda if it's low.
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post #5 of 6 (permalink) Old 11-16-2004, 11:38 PM
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i had mine drop from 7.5 to less then 6.3 overnight with CO2 going at 30bpm in my 5 gallon.
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post #6 of 6 (permalink) Old 11-17-2004, 12:18 AM
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I once turned off my pump to do some work, and did not turn off the solenoid on my CO2, to shut of the CO2 going into my reactor. After a few hours of cleaning, and not realizing the my CO2 reactor had aparently about filled up with CO2, I turned the pump back on. pH dropped from 6.9 to 6.6 in less than five minutes, and was still falling when I started an emergency 50% water change and massive surface agitation to release the CO2.

I'm still grateful I didn't lose every fish in the tank.

Steve - 33g reef and a 180g planted in need of a re-scape.
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