CO2 levels night and day - The Planted Tank Forum
 
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post #1 of 8 (permalink) Old 04-18-2015, 10:30 PM Thread Starter
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CO2 levels night and day

Hi All,

I am relatively new to planted tanks and learning fast. I keep reef tanks so very familiar with water quality and parameter evaluations.

My system is running a PH of around 7.55 and 4.5 dKH morning and 7PH with 4.5dKH evening. This translates to about 4ppm CO2 morning gradually rising to around 18ppm evening.

I am injecting CO2 between 8am and 8pm with lights on at 8.30am and off at 9pm.

Is this swing something to leave alone or should I be attempting to level out my CO2 levels evening and night?
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post #2 of 8 (permalink) Old 04-18-2015, 11:20 PM
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Your pH changes are OK, maybe not quite enough, depending on your light levels. A rule of thumb for planted tanks is a 1.0 pH drop from baseline, to get a good level of CO2 at average KH.
pH changes from changing CO2 levels don't bother fish.

Mine drops from 7.65 to 6.60.
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post #3 of 8 (permalink) Old 04-18-2015, 11:32 PM Thread Starter
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Thanks. So I would up my CO2 slightly (preferably) and/or increase my hardness (less preferable)?
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post #4 of 8 (permalink) Old 04-19-2015, 12:12 AM
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The only way to reach a higher concentration of CO2 is to increase the rate of CO2 injection.

A change to alkalinity (kH) will not effect the pH swing (you currently have 0.55 now - even at a new kH the swing will remain 0.55 if you keep the CO2 rate the same).
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post #5 of 8 (permalink) Old 04-19-2015, 01:05 AM
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Quote:
Originally Posted by imcmaster View Post
The only way to reach a higher concentration of CO2 is to increase the rate of CO2 injection.
+1
Unless you are using a pH controller on your CO2 solenoid.....
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post #6 of 8 (permalink) Old 04-19-2015, 01:37 AM
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ph/co2

According to your post , you are running your lights for twelve and a half hours per day. That is way too long. I run my co2 @ 30 ppm for 9 hours per day. It comes on 2 hours before the lights come on , and it goes off 1 hour before the lights go off. Your co2 should be at the max ppm you want it at for the day , before your lights come on.

My lights are on for 8 hours per day. How are you injecting your co2? What type of lights do you have. Any tank pics ?


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Last edited by rick dale; 04-19-2015 at 01:43 AM. Reason: edit
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post #7 of 8 (permalink) Old 04-19-2015, 01:39 AM Thread Starter
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Great, many thanks.
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post #8 of 8 (permalink) Old 04-19-2015, 03:18 AM Thread Starter
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Quote:
Originally Posted by rick dale View Post
According to your post , you are running your lights for twelve and a half hours per day. That is way too long. I run my co2 @ 30 ppm for 9 hours per day. It comes on 2 hours before the lights come on , and it goes off 1 hour before the lights go off. Your co2 should be at the max ppm you want it at for the day , before your lights come on.

My lights are on for 8 hours per day. How are you injecting your co2? What type of lights do you have. Any tank pics ?
Hi Rick,

I am using a Vertex Illumina 260. Ramping from 0 to hit 100% at 10am then starting to ramp down from 8pm.

I am using a sera reactor to dose CO2.

I am running the CO2 to the light cycle so sounds like I need to shift to a few house before lights on? Many thanks for advice in advance!

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