Just a suggestion, if it was me and I was doing this, I'd go with 6, 3 gal pots and better yet is 6 fabric bags. I'd veg them in those cups, until you have to water them everyday. Then transplant to like one gal pots till they need watering everyday, again, then plant into the 3 gal bags. When I used the 400w hps, i kept it much higher than 1 ft.. Probably more like two feet to start, then gradually lower it to that sweet spot. !! I don't see how you're controlling your tent temps., without an exhaust system. Wish you good luck on your grow and if i can help, i will.
The exhaust fan is outside of the tent, and it's an air cooled hood. Temperatures stay between 68-77 F and humitiy is constantly low at like 20-40% I could practically set the light on top of them and they'd stay cool, I am mostly concerned with giving them too much light when it comes to do the distance.
How long do you think it would take to grow into the one gallon pots like that? I need to be ready to harvest by the first or second week of December, so I am going more by time than by plant size. I know I could get better yield but I have to manage my time, and I have winter break to do all my trimming and stuff so I'd like to get them cut on time. All that being the case I am probably going to switch in mid October regardless of size, I am just trying to get them as big as I can in that mean time.
They're already growing into their solo cups really fast, needing water every two days already. Thinking about transplanting them into gallon pots before the 3 gallon ones as you said, but I only have 9 of those. :/ Plus they're not even a full gallon. I doubt I'll get paid before they outgrow the solo cups either.
I guess this organic nutrient mix is working okay. One of them had slightly burned tips, like super slight, none of the rest did. Maybe that one is more sensitive to nutrients. I mixed up another batch for them and am letting it brew. 300 PPM mix
I am thinking about amending my soil with some of this stuff before transplanting. I don't want to go too light or too infrequent with feedings again. Seems like nutrient burn doesn't do as much to stunt growth as malnutrition does.
Some pictures of the girls, couple days ago. Right now they're looking a little ugly since I let them dry out right until they were about to wilt. I guess this must be building the root system up pretty big, because before they needed water every 3 days and now it's down to 2.