[mordalphus]

Carbonic acid is the CO2 dissolved in water... First off, where would you get your hands on carbonic acid, then how would you be able to dose it into your water?

I think the much more simple method is diffusion of carbon dioxide in water.

After all, it's the CO2 that plants need to grow, maybe they wouldn't do so well on straight carbonic acid.

 

[mordalphus]

That's the thing, I'm not sure if carbonic acid is just a disposable bi-product of carbon dioxide diffusing into water, or if it's the actual fuel for the plants. I wouldn't think it would be, since emersed plants use straight carbon dioxide gas. You'd think that immersed plants would be the same.

But nature is a crazy beast, and you never know what she's gonna do.