Difference in size between two plants in Week 1

Hey cookie, So there will almost always be some variation with plants of the same strain, the smaller may turn out to be the better of the 2 in the end. It looks like you're doing all the right things for them, root juice, good temp and reasonable RH, so it's probably just a patient game. The only things i noticed with your week is , maybe watering at lights out could be stressing the one...sitting in wet soil that's probably getting a little chilly since the lights are off and if any fans are on. Also just from personal experience, i used to mist all my plants to boost humidity but I wasn't letting the water sit for a few hours and let the chlorine evaporate and it ended up giving me lots of leaf irritation and some spotting, which also might have been combined with misting during lights on versus misting at lights out. Just something to be mindful of if you see any problems pop up. Happy growing. ✌️