how come you dont want to use soil? if you used soil and some cfls you could leave them alone for days at a time and theyd thrive. i have to say other than that, i think DWC would be your best bet. i have my main area, and then i have this little experimental side area with a DWC 5gallon bucket, 3 45wcfls, and a 2ft t8 system from wal mart. I seriously barely ever have to do anything with that plant. Its growing incredibly fast compared to its soil clone sisters and also its putting out redonkulous amounts of trichomes. cannabis , especially landrace dominant strains tend to not require as many nutrients so i rarely ever have to add nutrients to the bucket. i have never checked the pH of the bucket except for the first time i put distilled water in. try growing some DWC with just a little bit of nutrients, youll be surprised. ill try to get some pics up of what im talking about soon.