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- - DIY co2 (http://www.tropicalfishkeeping.com/beginner-planted-aquarium/diy-co2-10852/)
Ok, so I have a question... I'm thinking about making a co2 system. My question is if I do this... Can I run it through my air stone? Thanks :)
Running it through an air stone is not a good idea. You would waste a lot of CO2 this way. There are ceramic diffusers and track diffusers available for this.
The problem with using an air stone is that the bubbles get too big, and the CO2 is then wasted. With the track diffuser, the bubble of CO2 has more contact time with the water, thus is more effective without the waste.
When CO2 is added to water it creates an acid. That acid contributes to the lowering of kh and pH. The scientific formula would look like this:
CO2 + H2O -->H2CO3
As for the diffusers, you have choices... here is a good example of a ceramic/glass diffuser
Track diffusers look like this
Hope this helps!
Thanks!!! this is helpful.... Lol the glass diffuser costs almost as much as a co2 thing I can buy at my lfs. I'll probably just do that then, it seems less risky then a DIY and hardly different money wise. Thanks again! :D
u can get some airline tubing and a airstone, take a deep breath and blow carbon into the tank :tongue:
Something seems to defy all logic bettybaby when you state that an air stone would not work with CO2 in imparting carbon into the water because the bubbles are too big.
The CO2 needs time to allow for the carbon to mix with the water. With the slower amount of CO2 entering the water through the air stone it would need more contact time with the water. The atmospheric oxygen pumped through the air stone at greater quantities allow for the oxygen to be plentiful in the tank at night while the fish and plants still consume this commodity - rather than plants creating it during the day light hours and photosynthesis.
Otherwise I would have some oxygen starved fish in the morning.
An airstone, when used with an airpump, actually doesn't introduce as much oxygen into the tank through the bubble rising through the water - really the introduction of oxygen comes when the bubbles reach the surface. Any surface disturbance will introduce oxygen (and CO2) into the water.
As stated, an airstone used with CO2 really is a very inefficient method of introducing CO2 into the tank.
The best method may depend on what type of CO2 you're using - on a yeast based system a Hagen ladder is a good way (if not very fish safe) or I know a man who used a very small powerhead with the CO2 running into it - the powerhead 'chopped' up the CO2 and dispersed it through the tank.
However a yeast-based system does not usually create enough pressure for a ceramic diffuser so these are best used on a pressurised set up. It might be worth checking eBay for these - I bought 2 diffusers and a drop checker from a seller in Hong Kong for 2pence. Ok so postage (with insurance) cost me £9.98 but that's a grand total of £10 or about $20 for our American cousins which isn't bad for 3 pieces of glassware. They're all doing a sterling job for me!
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