just getting started

just got the seeds to pop about 2 weeks ago and have transplanted them into rockwool cubes. most have grown about 2 to 3 inches and are now in dirt. i use the same dirt mixture water and light for all of them. most are growing great and looking good but some that started out promising look like they have almost stopped growing. is this normal or is there something obvious i am doing wrong. thanks

post some pics it will help others see whats going on.

like Pellet said, we need pics. MJ just like any plant. Has a "break" period if you will... Where it looks like its doing nothing... but then all of a sudden 2-3 days later it jumped in size. Possibly you need to up the wattage in the room