look at my DIG round II if you wanna see what a MJ seedling will don in STRAIGHT miracle grow moisture control will do. i put them in there at somewhere near 3 days and they kinda hesitated then exploded.. so i dont think that you will have any problems.. and transplant WHEN they are root-bound not on a pre determined time frame.. it will work out better that way i would imagine
and if you have any questions just ask i will be willing to answer as the only dumb question is the one unasked... or something like that
~MG