Co2 back on at same time lights come on? - The Planted Tank Forum
 
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post #1 of 15 (permalink) Old 06-04-2005, 09:13 PM Thread Starter
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Co2 back on at same time lights come on?

For those of you who's Co2 is on a timer, when do you turn your Co2 back on? At the same time your lights come on, or do you let the Co2 build up a while before that?

My Co2 comes on at 8:00am and first lights at 12 noon.
I think 4 hours may be a little much; I wonder if this could be contributing to some crud I'm getting that looks like brown dust bunnies that stubbornly stick to substrate.

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post #2 of 15 (permalink) Old 06-04-2005, 09:41 PM
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Personally, I have mine set to come on and off with the lights, same time.
Been working fine like that for a long time.

Craig

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post #3 of 15 (permalink) Old 06-05-2005, 01:00 AM
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Maybe a bit before, but it doesn't matter too much I'd think, seeing as how plants produce CO2 overnight. However, having it come on maybe 20-30minutes before lights-on would help.
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post #4 of 15 (permalink) Old 06-05-2005, 03:02 AM
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The only time my CO2 is off is when the bottle is in my truck and heading for a refill.
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post #5 of 15 (permalink) Old 06-05-2005, 08:52 AM
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...wont your pH rise over night, then start decreasing again when Co2 comes back on... again & again & again??? wont this stress the little fishies? aka bad mojo?
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post #6 of 15 (permalink) Old 06-05-2005, 10:37 AM
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Quote:
Originally Posted by Symbiot
...wont your pH rise over night, then start decreasing again when Co2 comes back on... again & again & again??? wont this stress the little fishies? aka bad mojo?
Well, poster and newsletter author Tom Barr says no, and everyone seems to be listening to him.
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post #7 of 15 (permalink) Old 06-05-2005, 04:09 PM
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Quote:
Originally Posted by Symbiot
...wont your pH rise over night, then start decreasing again when Co2 comes back on... again & again & again??? wont this stress the little fishies? aka bad mojo?
PH shifts induced by CO2 are harmless.
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post #8 of 15 (permalink) Old 06-05-2005, 04:34 PM Thread Starter
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Quote:
Originally Posted by Symbiot
...wont this stress the little fishies? aka bad mojo?

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post #9 of 15 (permalink) Old 06-05-2005, 07:47 PM
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Quote:
Originally Posted by Barbels

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post #10 of 15 (permalink) Old 06-05-2005, 08:26 PM
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Quote:
Originally Posted by Symbiot
...wont your pH rise over night, then start decreasing again when Co2 comes back on... again & again & again????
This is up for discussion. CO2 lowers the pH. Plants use the CO2. At night they don't. So CO2 isn't used up. So the pH stays exactly the same.

If only there were no losses due to surface agitation.

Personally I think it doesn't matter, 4 hours before or 20 min before or 24/7 or what, it doesn't explain brown crud. I run my diy setups 24/7 and the pressurized comes on with the main lights, running for 8 hours. This is saving 66% CO2 over running it continuously, and I don't need to worry about agitating the water over night. PH is about 7.5 in the morning and 7.3 in the evening which is just great.

Anyway... for simplicity's sake I would just turn it on and off with the lights if your setup has a solenoid.


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post #11 of 15 (permalink) Old 06-05-2005, 08:35 PM Thread Starter
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Quote:
Originally Posted by Wasserpest
Anyway... for simplicity's sake I would just turn it on and off with the lights if your setup has a solenoid.
Yes, that is what I decided to do starting last nite. I am plum tickled to say that pH did not move much at all.

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post #12 of 15 (permalink) Old 06-05-2005, 08:58 PM
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If pH induced stress from CO2 causes fish issues, why don't we have dead fish when we do large 50% water changes with pH differences of 1 full unit?
Try this at 80% water changes, same result as far as fish health.

That is the only pH swing we can have, ~roughly one full unit unless we do not add enough CO2 during the day. At night this takes several hours to rise, in a water change, it takes a few minutes.

A simple observation that any aquarist can try and often does answers if this is significant issue or not.

You may draw your own conclusion from this based on if pH swings from CO2 off at night are bad or not.


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post #13 of 15 (permalink) Old 06-07-2005, 04:19 PM
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Do you have a controller? The controller will not put more co2 into the water if it has reached the set point. The plants produce co2 at night. I consider this a redundant question. If your controller adds co2 after your set point has been reached, throw it out!

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post #14 of 15 (permalink) Old 06-07-2005, 07:50 PM
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Quote:
Originally Posted by Symbiot
...wont your pH rise over night, then start decreasing again when Co2 comes back on... again & again & again??? wont this stress the little fishies? aka bad mojo?
Well, the point of turning it off at night is to prevent exactally that. When the lights are off, the plants don't use any CO2, and infact expell it while taking in O2, just as we do. So, if you leave the CO2 on all night with no aeration or pH controller, you could wind up with EXTREME CO2 levels in the morning (potentially). So yes, turning it off fluctuates it a bit, but leaving it on would cause even more variation.
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post #15 of 15 (permalink) Old 06-07-2005, 09:25 PM
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See above: Your "PH controller" is set at say 6.8. You have achieved 6.8 before your lights turn off. Now that the lights are off, your plants expel co2. There would be NO REASON why your controller would turn back on because you have enough already. Why bother to turn it off? It is already off. Unless your controller is malfunctioning it will remain off until around noon tomorrow!

Eheim pimp #128, 55gal 13x20x48, Eheim Pro 2227, CO2 injected, into the filter breather tube,4x 55w Pcs , 12 hr light cycle (sunrise/sunset simulated), Milwaukee SMS 122, faulty bubble counter replaced with M3 bubble counter..... moderately Planted, Plantex CSM+B and ferts

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Last edited by ridns; 06-08-2005 at 05:30 PM.
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