most go 12/12 when the plant hits a ft tall or 4 or 5 good sets of leafs but u have good growth but no height at 30 days mine was close to 2ft tall urs is still under a ft so i'd wait till they were lil over a ft unless u have alot of space then u can let them grow bigger i mean the taller the better as more can grow but the least is a ft i would say