Just throwing my 2 cents in. I was growing 6 plants in 3 inch netpots in a ten gallon tub. 2 tubs under a 1000 hortilux bulb. 12 plants. They would get about 3 feet or so. I had them stagered to harvest 6 a month. I got 3/4 to a pound a month, that is untill my nephew turned me in to get out of coke charges. Each tub only held 5 gallons of water. They seemed just a little root bound but not bad. It was working well for me. Do a search for loc nar1958 (papaya). My grow is still here. I was about to change to 20 gallon tubs with 5 inch netpots. They are drip systems. Oh nice bud wish I could smoke now. I will be in Cali soon enough though. East Coast sucks.