Yea no problem for the tips getting your ph on point is a huge thing because if it's off they might not even be taking mutes up and you could probley get a little drop test kit for like 12 bucks at a hydro store or something similar, and I was also just thinking the skinny ness on the one plant could be from it not wiggling enough like from your fan cause fans is what makes the stems and stuff get thick so mabey your oscillating fan doesn't hit that one as good as the other and so it doesn't get wiggled as much and isn't building up the branches, Idk just something I thought of it also just could be genetic in that plant.
Alao looking forward to the new pics they'd probley grown quite a bit.