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Originally Posted by Tom Barr
An airstone will reduce the O2 by turning it on at night as the water has been oversaturated(beyond 100%) with dissolved O2 from the plants all day.
Why remove it?
Wait till the light have been off for several hours, maybe 6 or more.
Depends on your plant growth rate and density, but I routinely have 140-150% when the lights go off.
In the morning, I have 90-110%.
Regards,
Tom Barr
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Tom,
What about dealing with "excess CO2"(if there really is such a thing). I have found that the only practical way to assure constant 30ppm
DIY CO2 during the light cycle is to overshoot sometimes to as high as 54 or more ppm. Having read all the warnings about high CO2, over 40ppm, and having experienced gasping fish (before tank was heavily planted) I installed airtstone on timer to drop CO2 at night, which it does very effectively.
Is high CO2 a problem at all if there is plenty of oxygen? If a highly planted tank has 90 to 110% oxygen saturation in the morning does it need the airstone at all?
Bill