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Lol, "Similarly, novice growers should skip splitting. " Don't get too offended :)

https://www.zamnesia.com/grow-weed/434-splitting-cannabis-stems Yeah.. There is cannabinoids and there is terpenes, all of which work through gene switches / epigenetics. But looks like this isn't the place for this.

I remember reading about putting nails or something through the stem some days before harvesting to induce more resin production just before harvesting. So is anyone done something similar with their stems before harvesting? Just thought about pines and how their bark is peeled off either all...

Could be condensation? Double check the air exhange. Once troubleshooted a grow with similar situation, but the moisture was all around the buds. Turned out the exhaust fan was on the same timer as the lights. So lights went out and so did the exhaust fan. Warm and moist air starting to cool...

You should get some sort of pH measuring kit, drops and meters are both fine. Especially for soils grows I'd reckon the accuracy of drop testers is fine. There is different scale drop tests so you get better accuracy. I started with drops and then bought Bluelab meter which I've had probably...

Yes, too wet medium could lock P out.

Yup, pretty typical phosphorus deficiency. There is some cupping and praying also, might be slight Mg deficiency aswell. Both pretty mild, but could use a bump. Whatcha been feeding her?

After you get another pair of leaves and re-potted. Then few days to settle and then they are ready for full sun. Yes, sand for top layer to reduce moisture loss from the top (also good againts fungus gnats), should help a bit with the small cups before you get transplanted. As for the...

The compost should have plenty nutes for this stage. Now you just need to develop some root system and remember roots like moist and oxygen rich environment. So as said, I recommend you water from the bottom and could consider adding some perlite/leca/sand anything really to prevent water...

Yes, probably all around nutrient deficiency, N, Ca,Mg, because of the roots have been too dry/wet to absorb nutrients properly. Above is a good guess, but often so small cups are prone to dry too fast. Atleast been for me. My guess would that they've been a tad dry. This you should be able to...

Yeah, yellowing from the bottom definatly looks like typical N-deficiency and 2nd picture pretty typical calcium deficiency. But both are reasonably mild and definatly shouldn't cause nothing, but dropping some older growth. As for the curling I'm not really sure, my guess would be root...

I would call magnesium deficiency. The interveinal chlorosis is a Mg def sign. Also the red stems on leaves is often a sign of magnesium deficiency also. Phosphorus deficiency can turn the stems red too. The darker spots there could be just further progressed Mg deficiency. Since it's the only...

Something like 3:1:2 for vegging, 1:1:2 early flower and then 1:2:4 is pretty good starting point. Depends really on the growing method how much margin of error there is. If you are slacking water changes in recirculating systems, you need to be pretty spot on what you feed. But any kind of...

Yeah, it's hard to keep too small pot properly moist, but not too dry. Maybe you could try bottom feeding? Put the pots in a tote or so and water them from the bottom. Especially those fabric pots could work nicely like that. Maybe cover the top soil with something that blocks evaporating water...

Yep, as long as it stays moist it isn't really a problem. Put the light above it and I bet it would straighten itself. Or add the light intensity bit later when there's more roots. I've had bending stems in cuttings often when I let them lean againts water glass, so they try straighten...

In a established plant the bottom of the stem is fixed in place and the plant can adjust itself into light. So basically it is trying to turn itself pointing towards the light. Solutions is to adjust the light that it comes from above or increase the amount of light. Carefull with the amount of...

Lol, did I say OP's plant are cuttings? Big difference with lockout and toxicity. Which nutrients you think are locked out and which are in toxic amounts?

Well you can easily light stress a cutting with about 100ppfd 24/7. So it definatly depends on the root system how much they tolerate before it starts to stress them. As for ppm, it could be molecular instead of elemental so I wouldn't give it too much thought. How do you think Potassium...

Yeah, you could go heavier PK feed. Check the 2nd picture and compare the color of the leaves. That bluish tint is more often than not phosphorus deficiency. Also seems like you got K deficiency spotted out. And for consideration, could you be getting tad too much light? Few of the symptoms...

Hmm, well definatly looks like some N deficiency. But I reckon there is more deficiencies. No signs of overfeeding. But quite red stems, which is phosphorus/magnesium, here I suspect phosphorus. So you could overall feed a little stronger solution. Just don't overdo the nitrogen at this point...