o and i forgot to mention the nutrients that they give you are ok but there are DEFINATLY better out there. and its not a good idea at all to try to grow 6 cannabis plants the roots will be fighting eachother for room and nutreints which will take energy away from your plants THC production... i grow 3 plants at a time, sometimes 4 plants... but never more than that. and the drainage nozzle that they offer you when your purchasing it is a great idea it will make swithching out the water and providing the plants with some airtime ALOT easier