They are potted in medium sized pots, about 3-4 weeks old. 1 critical mass lowrider, 1 skunk #1 and 2 nl #5. They are potted in a mix of peat moss, perlite and potting mix. One of my NL plants is growing all retarded but all 4 plants are having the same issue with the new leaves being really white. I have them under a shade cloth with the rest of my garden just like they I wanted to get them adjusted to full sunlight ect.

The amount of growth has slow to almost nothing in the past week since the problem has started.

What should I do to fix this ?