well U can but it is not good to do so.

I did and it worked ok. but if I had used hydro nuts insted of soil nuts then my clones would have grown better.

and I didn't use any rooting stuff on my clones eather.

the air stones made the water bubble a lot lot of small air bubbles.

and the air bubbles R what make the roots grow. they give the roots oxagen thus maken them grow big and strong.

here is a drawing I made of how the roots grow better with an air stone in the watter. the small bubbles give the roots lots more oxagen and it makes the plant grow bigger and faster.