Saw that one of my plants got the taco leaves, so disheartened she was doing so well. She's the biggest lady of the bunch actually. Ive done a little digging and found some possible causes but can't seem to pinpoint it. So from what I've read it could be Mg lockout due to ph not being in range so I first thought ok maybe ph. Checked runoff and ph was at 6.8 and ppm was at 440 which to me is acceptable but of course defer to you guys as I am definitely a newbie. Not only do I have the same strain growing right next to her without any of the taco thing present as well as one other strain that shows no deficiency or unhappiness with grow conditions. This is literally the only lady that seems to be troubled, now I'm troubled because I can't figure this out. Def need your guys help badly. To give you more info...Humidity stays pretty steady at 50% and they're in week 3 of veg from seed. I've heard it could be heat stress, but that's surprising if it is since my 600w MH is something like 3' or more above this plant/canopy which to me tells me that they are not getting all they can be from that bulb at their age and in theory I shouldve already lowered it to minimize stretch. I was actually considering lowering it right before I went in to say hello this morning and that was definitely the plan before this problem reared it's head. The reason I had it up so high was because I put em under the MH at a very young age and when I saw they could take a little more was when I was going to begin to lower each day. Only now I have this taco situation and it's throwing me off. I don't know which variable it is because nothing is glaringly obvious at this point and I don't want to wait until it gets to that point. Not tryin to be a hero here, I'm callin out for backup! I'm so confused and need help guys. Can ya help a gal out?