Guiadance & Direction for usage of a Co2 system - The Planted Tank Forum
 
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post #1 of 6 (permalink) Old 02-21-2017, 05:24 AM Thread Starter
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Guiadance & Direction for usage of a Co2 system

So I have finally set up a diy citric acid system. It works well. I am not aiming for a high bps (~1.5bps), and with the diffuser I have and where it is placed, no bubbles even hit the surface at that rate.

What I am actually concerned about is, overall effects on the water column. I am letting it run 8-10 hours a day, kicking it on a few hours before the light comes on, off about an hour before toning the light down. Light is a satellite plus pro, 36gal tank with about 28gal volume, ~20" from surface to sub with light about an inch above surface. While I am obviously concerned about the plants otherwise I wouldn't be doing this, if push came to shove, I would be more concerned about the fish than the plants.

My real question is, is there an ideal kH for this type of situation? pH will obviously swing, is that safe for the fish? Currently, kH is 2-2.5, pH is around 6.4 during the day, 6.8-6.9 after lights out and Co2 is off. would I be better off with a higher kH leaving it on 24/7?
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post #2 of 6 (permalink) Old 02-25-2017, 06:43 AM Thread Starter
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Bump? Or any links to recommended resources? Searching here gets me so many different results. Does it really not matter? Should I just pick any goal kH?
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post #3 of 6 (permalink) Old 02-25-2017, 06:54 AM
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PH swings from CO2 does not affect livestock. What affects livestock is when there's too much CO2 or not enough O2.

2-2.5 KH is good for most plants. I'd leave that alone unless you have a specific reason to adjust it.


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post #4 of 6 (permalink) Old 02-26-2017, 12:07 AM Thread Starter
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Originally Posted by burr740 View Post
PH swings from CO2 does not affect livestock. What affects livestock is when there's too much CO2 or not enough O2.

2-2.5 KH is good for most plants. I'd leave that alone unless you have a specific reason to adjust it.
Thanks, I wasn't sure if there was a reason to adjust it, lol. I just wanted to make sure it wasn't at an unsafe level that could drop heavily from the Co2, since I am completely new to this.
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post #5 of 6 (permalink) Old 02-26-2017, 02:13 AM
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The lower the KH, the easier CO2 dissolves. All this means for you is it'll take less CO2 to reach 30 ppm 2 KH water than it would if the KH was 6.

For example 2-3 bubbles per second may be enough for you now. Whereas it might take 5-6 bps to reach the same ppm if the KH was higher.


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post #6 of 6 (permalink) Old 02-26-2017, 08:01 AM Thread Starter
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Ok, that makes complete sense, thank you. I've used the Co2/kH/pH calculators enough at this point I should've put that together myself. The math is pretty simple really.

And, does the added co2 cause the carbonates in the water to dissipate quicker than they would otherwise, like an organic acid? I am aware that co2 is not actually organic, nor an actual acid, but can form carbonic acid when dissolved in water. So does this mean that I should watch the kH closely until I get this system worked out exactly the way I want it, since it will dissolve the carbonates in the water faster than before I started this system? Or am I misjudging something here?
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