Kamon

I'm a little confused with the whole nutrients thing. I'm using Potassium Nitrate, Mono Potassium Phosphate, and Seachem Flourish for micro and macro nutrients. Is this enough for a 29 gal tank? If so, how much should I be dosing?

I'm using DIY CO2, which is easy to make and set up. The glass diffuser I was using doesn't work anymore (Do not know why), so I had to switch to an air stone instead (I also use Seachem Flourish Excel). Will an air stone be able to properly give my aquarium the right amount of CO2?

Note: I'm using 90w of light.