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#1
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additional aeration at night needed with C02 injection?
I just thought I'd toss this around the newsgroup and see what kind of
opinions I get: What does everyone think about adding more aeration at night when the lights are off and plants have reversed their gas roles. I have seen a few of my fish dwelling towards the water surface at night. I was thinking about the possibility of adding a timed airstone for dark periods. I am concerned about fluctuating PH, but more about oxygenation for my larger bodied fish. Thanx for any help you can give! Dave. www.picklyk.com/aquascape |
#2
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additional aeration at night needed with C02 injection?
That's exactly what I do.. Appears to work great!
Troy "Dave M. Picklyk" wrote in message news:TI8kb.118953$6C4.48157@pd7tw1no... I just thought I'd toss this around the newsgroup and see what kind of opinions I get: What does everyone think about adding more aeration at night when the lights are off and plants have reversed their gas roles. I have seen a few of my fish dwelling towards the water surface at night. I was thinking about the possibility of adding a timed airstone for dark periods. I am concerned about fluctuating PH, but more about oxygenation for my larger bodied fish. Thanx for any help you can give! Dave. www.picklyk.com/aquascape |
#3
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additional aeration at night needed with C02 injection?
As matter of fact, I was just looking this up yesterday and found this
article... The following is an excerpt and below that is the entire link: At night, on the other hand, the plants are actually using oxygen (and not CO2) If there are not too many fish in the aquarium, then the oxygen produced by the plants during the day will tide everyone over until the next morning. However, if you notice that your fish are gasping at the surface in the mornings, they are obviously running out of oxygen. To remedy this problem, you can simply turn on an air stone when the lights go out. This will keep up the oxygen level and remove excess CO2. I have the aquarium lights and an air pump on two separate timers; when one turns on, the other one turns off. It would also be fairly easy to rig up a solenoid valve for the CO2 supply and have it turn the CO2 on and off with the same timer that is regulating the lights. Here's the link: http://faq.thekrib.com/plant-co2.html cheers, Boris "Dave M. Picklyk" wrote in message news:TI8kb.118953$6C4.48157@pd7tw1no... I just thought I'd toss this around the newsgroup and see what kind of opinions I get: What does everyone think about adding more aeration at night when the lights are off and plants have reversed their gas roles. I have seen a few of my fish dwelling towards the water surface at night. I was thinking about the possibility of adding a timed airstone for dark periods. I am concerned about fluctuating PH, but more about oxygenation for my larger bodied fish. Thanx for any help you can give! Dave. www.picklyk.com/aquascape |
#4
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additional aeration at night needed with C02 injection?
It really depends on the setup. If you have a tank with high light
and fast growing plants and lots of pearling, then adding the airstone at night could be counterproductive as it would probably reduce O2 levels. It's common for high performance tanks to carry 120% O2 saturation during the day. Adding the airstone would bubble away both excess CO2 and O2. In lower light slower growing tanks, especially those with high bio-loads, the addition on a nighttime airstone may be unavoidable. Turning off CO2 injection at night would be the preferred course of action, if fish were still gasping then adding an airstone as a last resort. Cheers, Steve H. -- Steve H. Yesterday is History, Tomorrow is a Mystery But Today is a Gift...That's why we call it the Present! "Dave M. Picklyk" wrote in message news:TI8kb.118953$6C4.48157@pd7tw1no... I just thought I'd toss this around the newsgroup and see what kind of opinions I get: What does everyone think about adding more aeration at night when the lights are off and plants have reversed their gas roles. I have seen a few of my fish dwelling towards the water surface at night. I was thinking about the possibility of adding a timed airstone for dark periods. I am concerned about fluctuating PH, but more about oxygenation for my larger bodied fish. Thanx for any help you can give! Dave. www.picklyk.com/aquascape |
#5
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additional aeration at night needed with C02 injection?
Hi Dave,
I use aeration during the night. I just started using a pressurized CO2 system one week ago which is already proving itself! The ph is steady at 6.8 and I also think it is very important to keep the tank aerated when light are off in order to prevent big PH drops when plants also eject CO2. It is also a factor depending on your fish stock and size.... HTH "Dave M. Picklyk" wrote in message news:TI8kb.118953$6C4.48157@pd7tw1no... I just thought I'd toss this around the newsgroup and see what kind of opinions I get: What does everyone think about adding more aeration at night when the lights are off and plants have reversed their gas roles. I have seen a few of my fish dwelling towards the water surface at night. I was thinking about the possibility of adding a timed airstone for dark periods. I am concerned about fluctuating PH, but more about oxygenation for my larger bodied fish. Thanx for any help you can give! Dave. www.picklyk.com/aquascape |
#6
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additional aeration at night needed with C02 injection?
gizmo wrote:
Hi Dave, I use aeration during the night. I just started using a pressurized CO2 system one week ago which is already proving itself! The ph is steady at 6.8 and I also think it is very important to keep the tank aerated when light are off in order to prevent big PH drops when plants also eject CO2. It is also a factor depending on your fish stock and size.... The "big pH drop" is exactly 0.2 in my tank. Measure it and see. Unless you have a fish overstock, the aeration at night is unnecessary. |
#7
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additional aeration at night needed with C02 injection?
On Mon, 20 Oct 2003 15:29:24 UTC, "gizmo" wrote:
...lso think it is very important to keep the tank aerated when light are off in order to prevent big PH drops when plants also eject CO2. This and a number of other postings seem to assume that adding CO2 pushes out O2. This is not what they teach in chemistry classes (or, I think thermodynamics classes). The dissolved gases don't compete for space in the water, but tend to reach levels that depend on the amount of each gas in the air. Adding CO2 could displace O2 if you opened up the tank and filled the whole room with so much CO2 that you had a reduced level of O2; but you're not going to do this. _Plants_ in the dark remove O2 and add CO2; but the removal of O2 is what matters. Adding more CO2 from a tank won't push out O2 unless you're bubbling so much through the water that it acts like a de-aerator. (And even this won't happen, according to the widely held opinion that aeration does not work by exchange with the air in the bubbles, but by agitating thw water.) If there isn't enough O2 in the water at night because the plants are using too much, you'll need to add aeration; this will increase the O2, and it will remove some of the CO2 that you're putting out money and effort to pump in: not a desired effect, but an unfortunate side effect. (I'm not saying whether or not it's really necessary to do extra aeration at night when you have plants. Anecdotal evidence says it is. Somebody ought to do serious experimenting some day with a good O2 test kit. I can't, because my tank is massively aerated by the trickle filter, 24/7 -- and I use up a lot of CO2 that way, but it's not all that expensive.) -- http://www.dandrake.com/ In the days after September 11, Yahoo searches for Nostradamus outnumbered those for Osama bin Laden and Sex, combined. |
#8
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additional aeration at night needed with C02 injection?
On Tue, 21 Oct 2003 01:12:10 GMT, "Dan Drake" wrote:
_Plants_ in the dark remove O2 and add CO2; but the removal of O2 is what matters. Adding more CO2 from a tank won't push out O2 unless you're bubbling so much through the water that it acts like a de-aerator. (And Actually, plants respire (consume O2 and burn stored sugars) all the time, day and night. It's just that during the day, they produce more O2 than they use. (I'm not saying whether or not it's really necessary to do extra aeration at night when you have plants. Anecdotal evidence says it is. Of all the CO2 injected planted tanks I've seen in person, none have needed or have used aeration at night. And I've had and seen some incredibly densely planted tanks. Chuck Gadd http://www.csd.net/~cgadd/aqua |
#9
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additional aeration at night needed with C02 injection?
Chuck Gadd wrote:
Of all the CO2 injected planted tanks I've seen in person, none have needed or have used aeration at night. And I've had and seen some incredibly densely planted tanks. Chuck's should be the final word on this. |
#10
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additional aeration at night needed with C02 injection?
I have a PinPoint pH controller which turns on an airpump to increase
surface turbulence when the pH gets too low. I'm doing DIY CO2 with two 64oz juice bottles and a Hagen "Natural CO2 System" diffuser on a 29 gallon, heavily planted tank. I've found that my pH drops by more than 0.2 at night. The controller keeps the pH within a 0.2 range. If I were using CO2 from a tank, I'd probably just try to get the amount of CO2 injected to the right level, but with the DIY CO2, it seems easier to inject a bit more CO2 than needed and let the controller level things out. "Dave M. Picklyk" wrote in message news:TI8kb.118953$6C4.48157@pd7tw1no... I just thought I'd toss this around the newsgroup and see what kind of opinions I get: What does everyone think about adding more aeration at night when the lights are off and plants have reversed their gas roles. I have seen a few of my fish dwelling towards the water surface at night. I was thinking about the possibility of adding a timed airstone for dark periods. I am concerned about fluctuating PH, but more about oxygenation for my larger bodied fish. Thanx for any help you can give! Dave. www.picklyk.com/aquascape |
#11
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additional aeration at night needed with C02 injection?
I don't think I'll worry about it. The fish that I've seen dwelling around
the surface of the water are not at all gasping for air...that's probably where they are most comfortable sleeping. Since I do use a "waterfall" type filter I think the water turbulance is just fine for O2 support. And I do realize that O2 and C02 are pretty independant of eachother. I'll trust your judgement on this Chuck since you seem to have enormous experience Dave Picklyk www.picklyk.com/aquascape "Dave Millman" wrote in message ... Chuck Gadd wrote: Of all the CO2 injected planted tanks I've seen in person, none have needed or have used aeration at night. And I've had and seen some incredibly densely planted tanks. Chuck's should be the final word on this. |
#12
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additional aeration at night needed with C02 injection?
I don't think I'll worry about it. The fish that I've seen dwelling around
the surface of the water are not at all gasping for air...that's probably where they are most comfortable sleeping. Since I do use a "waterfall" type I notice many of my rainbows hanging near the surface at night. But, my SAEs, which are known to be VERY sensitive to low O2 levels, are sleeping on leaves at the very bottom of the tank. I agree that it's probably just where they like to sleep. Clearly, if you see fish gasping at the surface, then fix the problem, regardless of what any amount of experience says! Chuck Gadd http://www.csd.net/~cgadd/aqua |
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