Best Size Growing Bins for DWC/Bubbleponic Flower/Veg & Number of Plants in Each

Hello everyone, I'm planning on building a deep water culture, otherwise known as a bubbleponic, system for both vegetative and flowering plants. I'll be using Rubbermaid Roughneck plastic storage containers for the job. My question is, if I wanted to fit six flowering plants in one bin, what should be the appropriate gallon-size of the bin?

I'm also concerned about the plant spacing. I don't want them to be too close that they're competing for light, but there's really nothing I can do about that even after the variables. I've heard it doesn't really matter much how close they are to each other, since they apparently just grow taller to reach more light. But I don't know if I really believe that too much, because I argue that strains of plants would attest to the stability of their genetics by consistently growing to a certain approximation of height when growing conditions are optimal and maintained.

An 18 gallon's length is 24", so divide that by three, which, I figure, leaves about 8" between plants. But if I went with a bigger 25 gallon bin, that would give about 9.6" between the plants. There is also a 31 gallon sized version I could use if necessary, which would increase the plant spacing to 10.75".

Here are the dimensions of the bins I'm considering:
Roughneck Storage Box - 18 gal; 23.9" x 15.9" x 16.5"
Roughneck Storage Box - 25 gal; 28.8" x 19.7" x 16.5"
Roughneck Storage Box - 31 gal; 32.3" x 20.4" x 16.7"

So is there a general rule for gallons per plant necessary for DWC plants to thrive? I'm planning to grow strains that require up to a three month flowering period, that offer generous yields, so I need to make sure I'm not bottlenecking their potential in any way. Although I'm still shooting for six plants per bin, for the aforementioned reasons, only growing four flowering plants per bin might be ideal; that way, an 18 gal bin would easily suffice. But I will have to buy a third extra of all the equipment if I went four plants instead of six; that's why I'd prefer six.

Another question: which of those bins should I use for the vegetative system and how many plants would be appropriate to fit into them? I'm presuming that using a lower-gallon bin would be sufficient.

By the way, the lights I plan to use are one 400w MH for vegging and one 600w HPS for budding. I will have up to three, 6-plant flowing bins (or four, 4-plant bins), but I'll probably only start out with one or two.

Thanks ya!
 
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