Sofa + broken bed, turned grow room

Minor update:
I have begun to get the hang of what the plants want and need and I am still working on improving the grow box. Better ventilation, sound control and have been looking into light movement.
The plants are really started to take off and I am really curious to see the different sexes, I have even thought about taking clones just to see witch way they flower..

Sadly my friends plants are doing terrible, it started with a small case of nute burn, then with no change became worse, I then told him about nute burn and that he could flush them to get out the salt build up.. After he had flushed them, he was scared to feed them any thing again, so now they have huge deficiencies and have totally yellowed out. I convinced him to make a new nute mix and he now feeding them again, but I don't think this will be he's last problems..