Lighter green leaves

Umm kush man does not understand what ph is. Temp effects ph. Poking holes causes root damage, and then those bits rot in soil. Then you got root rot, and a dead plant. So this is how half ass solving a problem ends. Your soil will compact regardless. Even in transplant you will just have different compact sections. For Autos never transplant. Photoperiod you can, but like once or twice a grow tops. Does not really solve compacting issue. Punching holes in substrate does not do anything, but make water bypass where it needs to be. Plus mess up roots. Transplant once if you can, and just go to a bigger Potter for rest if grow on that transplant. I had to come back to address that crazy warm water ph don't matter bs. 👍🏻

OMG this setup 😂 I do not get why some growers wants to make everything more complicated. If you get a light mix soil (with perlites, who seems to miss in your soil) you water with "lukewarm smooth" water (with root stimulant) you do not have to worry about PH. If you want to loose time with this, go to Hydroponic. Another thing, I suggest you to transplant 2-3 times in your grow, 2 times in Veg and 1 time before bloom. (depending on the size of the plant and jar's size) How to avoid "compact soil" issue : I've found a solution to give air your soil, cause root stimulant can compact the soil more faster. take a piece of metal lengthways brooch u can find in your kitchen, and you make long holes all over the soil to the bottom. (ofc without destroying the big roots, particulartly the taproot), You just have to do this sometimes, maybe 1 out 3 waterings, when you feel the soil is like a rock. It's a little bit tricky but worth to do it imo. Otherwise, your leaves are healthy and everything looks pretty good. Good luck for your grow 420

Looks like the light to me mate, look at the edges of the leaves they are all going upwards and getting slightly discoloured, just raise the light a wee bit mate, another reason I think it's the light is because it's there to see it's mainly the top of the plant we can see the discolouration. Give her some calmag in her next water.