Will a tight space limit plant growth

Newbie here – I have a 4 x 2 x 6 grow tent with 5 autoflowers (Zkittlez Feminized (pack of 5))… They’re all in separate pots but it seems tight. Will this limit the plant growth, or should is there anything I should do to ensure they properly mature?

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I personally only grow 2 plants in my 2 by 4. But its also an issue as to having enough light for 5 plants. More then likely all 5 plants will not develop to their potential. This is what my tent that size currently has in it. They are just starting to flower, however these are pheno clones not autoflower plants.

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Going to be tough. Will need to grow straight up. Still might not be enough.

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I can manage 3 in my 2x4, but even that is tight.

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