Tom's "New CO2 revelations", led to a discussion (on another board) about using air which is .03% CO2 to get CO2 to plants. Shalu has been doing this with an air pump fed into a HOB. Tom suggested and I want to try using compressed air fed into a ceramic diffuser or something else to create microbubbles that would then be dispersed by a powerhead, the same as he's doing with CO2.

I'm going to start putting this together tomorrow and would like to hear any feedback. I have a compressor and a tank so that parts easy. Pressure would be low enough that regulating pressure should be easy but I'll have to research that a little bit. Then it's a matter of creating the microbubbles to disperse. I doubt anyone has a ceramic diffusor locally but I'll check. Another idea is a Duetto with aerator.

Open to ideas and suggestions........

Bill

i think you must have misunderstood something somewhere...air is roughly 79% nitrogen and 21% oxygen with small amounts of trace gasses.

Here's a link http://www.physlink.com/Reference/AirComposition.cfm

It's only about 0.03% CO2! The bubbles will drive out what little CO2 you had from your fishes.

Rafael

Sorry, it should have been .033%............ I corrected message above

See Fick's 1st law of diffusion for more on the mechanisms as to why this works.

Regards,
Tom Barr

Is there a risk of fish getting "gas bubble disease" with injecting a mist of air into a tank? A couple guys have raised this issue on the APC forum but I haven't really found anything definetive in searching around the internet.

Thanks, Bill