Yeah it had those issues when I got them from my brother. All the new growth is very healthy for the most part. This is how there looking lately. just about 2 weeks in veg! I also topped the two biggest plants, defoliated just a tiny bit (it was very cluttered) and raised up the smaller plants to get equal light:
this was 4 days ago: (only back right was topped in this picture)
this is today: both plants topped in this picture and smaller plants raised up. (only 4 days after previous picture and such a big difference!)
to raise up the pots the younger plants are in i got some old 7 gal pots (that came with tent) and cut them in half. turned the bottom half upside down and it fits perfectly snug inside the run-off tray that came with those pots and my 3 gal fabric pots fit perfectly ontop of that. i can even water them while ontop of the pots and the run-off is a waterfall down the side to the tray. its beautiful if i say so myself