heres my little bubble setup, I use the bottoms of my 6 inch pots to line the bottom of my 3 gallon tub. the bottoms of the pots make good "channels" for the air stones. I didnt have any hydroton to fill the bottom of my pots like I wanted to and I didnt want to get any at the moment. so I filled the bottoms of the pots with about 1 inch of perlite, that helps get plenty of oxygen to the roots. then I'm using a really airy mixture of potting soil and perlite as my medium. 3 to 1 perlite to soil. and i'm starting with tap water with superthrive, and once the medium has soaked up some water i'll drop in some seeds and wait for something to happen. I've never ph'ed any of my grows, but I plan on getting a tester soon. and there you go, now lets hope for a girl or 3