problem with growing

Hi everyone. Started my plants about three weeks ago. Looked beautiful and grew quickly for about two weeks. Then I started noticing a purplish shade on some (mostly bottom fan leaves) that turned into a copperish color and then leaves started turning yellow on bottom and moving it's way up...

Not my first grow, but first time this has happened to me. I’m sure it’s some sort of deficiency problem, I just don’t know what. The leaves aren’t really “taco-ing” but they are super wrinkled and only on some leaves? There’s also I think some nutriant burn? I don’t know I just couldn’t find...

Week four of flower and my leaves are turning brown and crispy. I know I have a slight over watering issue, but besides that I don’t know what’s happening to the leaves. Temp never goes over 81F and never below 68. Feeding hasn’t changed. Lights about 14 inches away led 3 600 watt growstar...

Hi guys. I need help, I'm desperate. Every time I try to grow the plants go bad near the end of the flowering stage. Let me explain in full. I grow autoflowering plants indoors and use 400W light. At first it grows fine, without any visible problems, leaves look good and green, then the...