Have a look. It’s in the same soil consisting vermicast, coco peat, rice hulls, soil, and CRH. It is light, loam soil. 

need I mention that 3 plants get to share those old wrong spectrum  bulbs? It takes 80w to start with a CFL per plant. It couldn’t stretch out any farther bc they are so close already. 

but I am not arguing let me clear that out. I actually am asking help. I know there could be a lot of factors as to why it’s like that, but if you had one single arrow to hit a target, what could  it possibly be?