B I G & small whats the problem?

here we go i started these at the same time one in a peet pellet and one in rock wool one is small and one is big how can i make the small one big? im using cfl's for veg 6 6500's and as you can see the one in peet is doing great
any help to get the rock wool up to speed will be greatly appreciated all is the same for both except the medium WTF

wow that sucks. the bigger one looks pretty good though

im not sure but i think if u plant it in soil it may grow better

hey try planting in soil