What is happening to these leaves?

100 percent what all the other growers are saying your ph to high if humidity was 35 percent then to low nutrients to much and looks like a possible mute lock out and I see you have 2 lights up when small I could be wrong but be better 1 light and a bit closer so they don’t stretch best of luck buddy I hope they turn out beautiful little girls no doubt they will it’s a good community I see 😎👌👍 happy growing 😁

What you are feeding them is totally incompatible for cannabis, 20/20/20 all purpose fertilizer is completely wrong for cannabis, even at quarter strength, you really need to get some proper cannabis nutrients. Grow nutes around 5/2/5 is something more in the ball park. Continuing with 20/20/20 is going to cause massive problems down the track, as you can see, the problems are already starting.

If you need any other help with this hit up your DM's Your inbox is the little green arrow on the bottom right hand corner. Good Luck!

Fully agree with both growers. Clearly is not a case of phenotype, as all your plants are stunted. What I'd do, is increase nutes, with such a low TDS PH needs to be spot on to allow the plant to focus on mute uptake, and it's not doing that, it's energy is trying to stabilise your PH prob. M0uses PH range is perfect. My plants for coco I made sure not to go over 6.3 at that's even high. Increase nutes. I'd say 4-700 is good for 1-4 so plants but I know yours is further ahead but because of their size I'd treat them as though they were 2/3 wks old. But because they are sooo stunted at this stage this far in, I don't think you have enough life span in your autos to even get an ok harvest. Have a look at my tangerine dream I stalled it in wk 3 but I brought her back and just by luck she didn't flower and kept pushing on as though she was frozen in time, and when I fixed it's like it started with no probs. It says wk 7 but I'm looking and treating it more like wk 4. Don't switch to bloom nutes. With a bit of luck you might be able to get em back on track but most likely when they come outta their stall they might enter flowering. So, fix prob and give a wk and if you see any sign of no signs of growth/ but flowering then sadly I'd start over bro. If they were fems you might have a better chance of bringing to harvest and even then it'd be small. With autos their key steps and you have to hit them on point and even all that your auto might just go the way it wants. Fix probs wait a wk, but even that, ur prob just wasting a wk you could have used to make up with new seeds. Also, your light is too far away, if using such low nutes then you at least have to make sure everything else is spot on. Also, for autos, if you get them fixed and decide you wanna try bring to harvest you can make autos stretch by dropping the temp by at least 7-10c and that makes autos stretch. But again, you doing this to plants that don't know what stage there in, it's really gonna be down to luck. But by seeing all your plants stunted you know it's 1 or 2 main things your missing. Increase nutes to 4-700 1-4. 7-900ppm wk 5-7, wk 8-harvest 900-1400 at max, and even thats high and down to strain. Some like more nutes than others.On wk 5 turn to bloom nutes/sugars. But as for them. Me I'd start over. 5.8-6.2 max. But again in later stages of flowering PH can be higher but must be in the range m0use said to get the most out of your autos during early stages of veg even right up to mid flowering happy growing. good luck.

With this soiless grow, you can go through my MOAB diary to learn what these plants need and when. If you read through from the start, it is a total peat grow dairy.

Looks like the start of a PH problem.