Hello,
I absolutely think it's feasible to grow 5 plants in one container. In fact, I think it's the best idea I've had in a while.
Here's my reasoning:
1) Shorter Veg time. 3 weeks AT THE MOST! Probably less. I don't want them more than about a foot tall when I put them in to the flower room. However, I'm keeping the light VERY close so that the nodes are as tight as can be.... Minimal stretching is key here.
2) Larger harvest. I believe that each plant will generate at the least 1 oz of dry bud. I actually think it will be closer to 1.5 oz per plant. If all 5 do 1.5 oz's then that is 8 oz's total dry bud. The best I've done with one plant is 7 oz's and I had to veg her for 2 months.
3) Better use of lighting. My lights are 400W HPS in the flower room. My hoods measuer 22" x 22" x 22" x 22". The light dispersal covers the 5 smaller plants a hell of a lot better than it does one huge plant. This is due to the plant growing outwards as well as up. You don't have much outward growth with shorter plants. So with the shorter plants, the lights will be focusing on just a few main colas on each plant. I expect very fat colas!
4) Less time manicuring. There will only be a few main colas to have to trim up. There will be a hell of a lot less inner budding and absolutely no "outer" popcorn buds to deal with. I hate manicuring. It takes up so much frickin time. I expect my manicuring time to be cut in half if not more...
That's pretty much my main reasons for switching to SOG. Pretty soon I believe that I will only be doing SOG grows. I can already tell that I like it. It all depends on the yield of this first test run. We'll see. Like I said, if I get 5 oz's or more, then SOG will definitely be the way for me!
Glad to hear you're diggin my idea of tubing instead of air stone. I like it too! your dimensions are not very big. How do you plan on having a veg area and a flower area in such a small space? You do need both if you want to keep a continual grow going. I'd suggest a 400W HPS light. You can veg under it, and more importantly it's the best spectrum when you flower. I've veg'd under my HPS lights, and saw no difference in growth rate (though I do have two 400W metal halides for veg'ing). Just make sure that in such a small space you have excellent ventilation, excellent scrubbed exhaust (I mean a filter), and good fans running. You might have a bit of a fight on your hands keeping the temps down... But you won't know until you start growing. You can deal with each problem as they arise, just get started!!!!
-S