Just posting pics of my current first grow at 32 days. Left is blue dream auto and right is sour diesel auto. Next grow I think I’ll keep it to either one plant, or 2 of same kind. The height disparity is killing me with the lights 
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Won’t be long before root mass takes up nearly entire res either, which will cause swings in ph and ppm of your solution. If you don’t have something else planned i would look into getting their expansion res pretty quickly. Good luck with these!
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Agree with @dbrn32. A few cultivators do well with seedlings in that size res but transplant after a good root mass is established 
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