12-02-2006, 05:14 PM
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Ok the reason is that bottled CO2 can supply high concentrations of CO2 and dissolve it quickly in the tank.
Fish respiration produces little CO2. As for oxygen countering, your right in part it does, but you dont really need airstones, you see oxygen is constantly in touch with water at the surface, the more surface area the water has the more it can absorb water, eg. if you have a filter outlet above the water level causing a splash you will be causing the water to absorb oxygen. i am trying to type this as basic as i can so that it makes sense- apologies if it doesnt.
PH is an effective way of measuring CO2 in water, as the more carbon you add the more acidic the water becomes. this is because by adding CO2 to water you are creating carbonic acid. If you have a GH of 3-4 then 6.8ph will be adequate supply for plant fert.
The softer the water the more prone it is to Ph crash from CO2 injection, the harder it is the less prone. Hardness is measured in KH carbonate hardness and GH general hardness.
Also it is Harder to mix CO2 with water than O2, this is why you need special reactors to mix the water and CO2 together, you cannot just let the co2 bubble out into the water. If you inject CO2 in your tank it is critical that you do not disturb the water surface, else you are displacing CO2 and just wasting your money, although should you inject too much CO2 then this is a great trick to employ.
I think thats the answer that you were looking for.
There are systems that employ sensors for injecting pressurised CO2 and O2 to keep are more constant PH, but the O2 used is only their to counter a rapid fall in ph during dark hours, the really big tanks also employ digital fert doses, and temperature control.
I dont know if anyone has seen amanos personal tank, but it has a filter and maintenance system the size of a medium sized family car lol :)
Any more questions post,i will try and answer them ;)