It is hard to imagine a scenario in which a NPT developed excessive CO2. CO2 is the limiting factor in a NPT (after light) and the problem is in conserving it, not getting rid of excessive build-ups.Running a bubbler at night is often done to reduce the CO2 while the plants are not using it, but are actually producing it.
Thank you, Bill. Well said.It is hard to imagine a scenario in which a NPT developed excessive CO2. CO2 is the limiting factor in a NPT (after light) and the problem is in conserving it, not getting rid of excessive build-ups.
High tech tanks with CO2 injection typically run at 20 to 40 ppm. I doubt that a NPT ever gets much above 5 or 6 ppm. (Those with CO2 testing devices, please help. I could be wrong.)
Now, it is possible to have too many fish in a tank, planted or bare, and aeration might be required to keep them alive. That can be done in a NPT, too, but one should be aware that dong it will have a negative effect on plant growth.
These words are so true, and the reason for keeping an open mind and remembering what to do in given state of affairs.Every ecosystem is different. (That's what makes them interesting.) Sometimes you may need to add aeration, or as in your case, you're fine without it.
Thanks for writing.
Sorry, but you're going to have to explain this a little further...In planted tanks which are not being enriched with CO2 supply, the aeration during day and night is a win win situation. 1. At night it prevents the over utilisation of (therefore possible depletion in) O2 in densely planted/over stocked tanks; 2. and during the day keeps CO2 levels from going down under the pressure of photosynthesis, by keeping the diffusion from the atmosphere at a higher level.
3. In tanks being enriched with CO2, aeration during the day will increase the escape of CO2 as nature will tend to keep the gas in the tank at the same proportional level as CO2 concentration in the atmosphere.
I hope the answers given in blue satisfies you.Sorry, but you're going to have to explain this a little further...
1. How does an aerator (bubbler) prevent utilisation of O2 in a planted/stocked tank? A bubbler adds oxygen to a tank (at least thru agitating the surface), I don't see how adding O2 can prevent O2 being utilised... 'over utilisation' was the word, over utilisation of a limited supply; aeration constantly adds to the supply preventing over utilisation
2. And then during the day prevents CO2 levels from dropping??? Surely the "diffusion from the atmosphere" is exactly what reduces CO2 levels, by way of gaseous exchange with O2 at the water surface (as mentioned above)...?diffusion from atmosphere does not reduce or increase CO2 levels if the level is at the ratio as ruled by the CO2 content in the atmosphere. In CO2 enriched tanks the content of CO2 in tank water is higher than sustainable by normal atmospheric condition -- here diffusion will be acting to reduce CO2 content in the tank; In non-enriched CO2 tanks the CO2 level is what is naturally caused by CO2 content in the atmosphere, photosynthesis causes reduction of CO2 content from this natural level, here diffusion will be acting to increase the CO2 content in the tank. The aerator does not do anything other than increase the rate of diffusion by increasing the surface area for diffusion
3. Wouldn't having CO2 gassing off (escaping) during the day makes the whole idea of putting it (CO2) in the tank in the first place pointless? I thought the whole reason for not having a bubbler was so the plants could absorb as much CO2 as possible and produce oxygen (by way of photosynthesis) for the fishies to breathe? As for keeping CO2 levels in the tank in proportion, isn't that why we have needle valves, bubble counters and drop checkers...? Your use of the word 'proportion' is to mean high, while I have used it to mean in the proportion as in the atmosphere. I think this is where you missed my point.
Sorry, I don't mean to be terse, but are you sure you haven't got all this back-to-front? No, its quite simple, read it again.