Chester
Honey Hugger ...
This plant looked a lot like your biggest at 3 weeks ... about week 4 she was given a full Flower tab ... Bear in mind it was grown w/ a very high quality LED and spring water ... 
https://www.autoflower.org/index.php?threads/nirvanas-auto-blue-mystic.37050/page-3#post-829957

https://www.autoflower.org/index.php?threads/nirvanas-auto-blue-mystic.37050/page-3#post-829957