yes nutes are still important... treat it just like a normal soil grow, except you will need to water slightly more often and see much faster growth

you can use whatever *acceptable* container size you want... generally 1gal per hieght of plant... i usually flower my plants a little early to keep them ~3ft... so i use 3gal containers... i start them in small containers like normal and xplant them into the airstone buckets, but i have started seeds in the airstone buckets as well

that is most definately a nasa worthy experiment :dance:

co2 enrichment is mainly used in closed systems, where it is needed... for the small cabinet / closet grower co2 enrichment is uneccesary. there is plenty of co2 in the air for the plant, and if you have good ventilation with air intake and exhaust to your grow area, then not only is the extra co2 not needed, but it is blown away before the plant has a chance to use it. if you were operating a setup that had ventilation, say, like a cool tube, but no fresh air exchange for the plants, then co2 enrichment is a must

that being said, a closed system with co2 enrichment is capable of delivering much more co2, but the plant only needs so much co2, and the difference is negligable, IMHO...