Originally Posted by TMaier
I have plants. So I might be good with discouraging the surface gas exchange? I am going to submerge the bar and keep a close eye on things.
Thanks for your help and patience in light of my abesnce of it.
This is a hot topic really. If you don't use co2
gas injection then the co2
will be produced by respiration and metabolic breakdown of organics via microorganisms. Normally the amount of co2
in the water column is greater than the equilibrium value with air but if you have lots of plants this supply can easily be depleted in a few hours after lights on which results in a lack of co2
and plants start to suffer. Suffering plants then begin to contribute to the low oxygen levels in tanks that do not offer good surface agitation. Therefore it is a good thing to provide good surface ripple even breaking the surface to allow better gas exchange and provide good flow rate and distribution to move oxygen around the tank and to the filter. The bacterial processes have a large demand on the oxygen content of the water and the more decaying organics the greater the biological oxygen demand (BOD) so you will want to keep the tank clean. Breaking the water surface gently will allow a small but constant supply of both oxygen and co2
in to the aquarium for the plants and for the bacteria to efficiently carry out their biological process which again will benefit plants and Ecosystem. When there is a lack of oxygen the bacteria have to obtain other less desirable electron acceptors like sulphates. These low oxygen areas are bad for plant roots and bacteria and the ecosystem as a whole.
Gently position your spraybar towards the surface just below the water line.
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