how do plants get the carbon necessary for them to grow?

[arjun]

Hi, I have some free time this summer and I want to try growing a plant hydroponicly. I don't want to spend a lot of money because I don't have much, ha ha ha. Anyway, I want to do this in a water solution. Anyone give me some tips or links to where I can find a picture or plans for a 1-plant aqua hydroponics setup? Thanks.

Oh, one more question...how do plants grown hydroponicly get the carbon necessary for them to grow?

Thanks: arjun