Can anyone tell me what's wrong with these leaves? They're from a seedling

[Myfriendis410]

About post number 135

My Journal Started As One Thing And Went Off The Rails Continued

Finally starting a grow journal. My focus started with a Jack Herer and is now a Gold Leaf and GL clone, all in coco. I’ll start with the JH sprout and add as I go. [20170729_133538] At 1 week [20170816_125836] At 2 weeks [20170819_165216] At 3 weeks Using GH grow, ph 6.0. I had a little trouble early on because I was ph’ing a gallon of water to use and I’ve been using citric acid to ph down. The problem is (I found out later) that it’s only good for about 8 hours and so I was watering…