Hi there 6-7 weeks car I don't understand what could be in the middle of the trouble, it starts to turn yellow pH 6.3-6.4 Ec currently 1.8 Day 27C Ove

by ph, guess its soil. from plant look - you overwater, aka dont have wet/dry regime. start lifting pots and water when needed. it could be low temps during night or even "wind damage", temps too high during days, 27 will bring tall and big plants , but fluffy buds, so weight loss. i see no yellow tho ....