I have two air stones in my res, they are attached to an aquarium dual output air pump.
I used black air tubes so i wouldnt have to worry about algae in there.
I use distilled water most of the time, its clean water that plants seem to love. I bought an electric distiller off amazon so i wouldnt have to buy water. Make sure you get a ppm or ec meter, thats how you check your water and nutrients. I make up a gallon of water and add my nutrients to that gallon then pour that into my res. but yes you can add the nutrients to the res if you prefer directly, just do not mix the nutrient trio's together without water, that causes nutrient lockout.
JP
JP