Please Help On My First Grow (attempt 2)

Once the seed sprouts its in Vegetative State. It can be a sprout, and young plant or a mature plant all in the time it is in veg, it just depends on its age. Photoperiods only switch to flower when you give them 12/12 light cycle. Its the uninterrupted darkness that does this. that's why you can keep a photoperiod plant in veg for years on 18/6 as the darkness is not longer enough. 50% dim for seedlings sounds ok, but cannabis can take a DLI of aorund 40 from seed, so give it all it can handle for maximum output of growth. I would not go above 40DLI though as it requires more CO2 and other enviroments to be in control. If you have any PPFD maps for your light at different hang heights and intensities "dim settings" you can figure out your DLI that way and get its in a ballpark range. I have to run my twin lights at aorund 60% to get 40DLI on 12/12 schedule. Good Luck!

I'm not familiar with your nutes, but I think you're probably going too hot(strong) too soon. A plant this age barely has a root zone big enough to absorb anything to begin with, coco or not. With the nute line I use I'm barely using a teaspoon total per gallon on a young plant and you're pushing over 8 tsp per gallon. Feed light until either growth picks up or you are getting pale leaves, which tells you it's ready for more. You can't just load up a plant with nutes that's not ready and expect it to take off. Your first couple weeks are about building a root zone.

in veg stage nothing, in flower some bud rot or other mold ciguhikkgjan start with such spikes. you will need to increase air circulation later in stage or think about wise defoliation.

Springtails and they are harmless. I had them underpot . If bothered treat them. I put some pesticide of some sort on them and they did jump then lol

My thoughts with high RH are that at 70% during lights off will be fine so long as your temps get to low, 20c should be fine, at 16c I'd imagine you will start getting rot or Wpm. This is as long as you are running your exhaust fan and oscillating fans. Your day time Rh and temps are at a decent level. Most of the time I can keep my night Rh around 60% but there are certain times during the year its almost impossible to keep it below 70%.

Not really a huge problem and very simple to solve it. It is clear that you have a calcium imbalance, probably due to two main issues : at the moment perhaps the PH rate is very low (I assume that your PH rate is around 5.8 up to 6, and this rate is not the best for the calcium integration); second measure that you should start to provide right away is linked to the calcium available. You can solve this imbalance in not more than 36 hours, by raising the PH up to 6.3 to 6.5, after that you can provide some CalMag or solve some Bone flour in your watering process and to facilitate the integration of calcium you can put some Kelp (Ascophyllum nodosum) on the watering solution both by fertirrigation or spraying in foliar sprinkling. You have one of the best liquid kelp supplies on the Cultivers brand (on Amazon) and kelp is a kind of the magic solution for almost every stress or imbalances that you can pass trough your grows. So as I told you you can solve this problem (easily and fast - within not more than 2 days): raise up PH to 6.3/6.4 ; use a little CalMag (important...not a lousy brand but a good one, and preferable a mineral one) and finally use kelp as a stress reducer and as catalysator to calcium integration (the calcium normally is available in much products, but it's vertical availability and the way that is integrated is hard. The last option and once for me was the most optimal (but almost desperate) solution was using what a botanical PhD friend of mine, though me to do as desperate measure, that was to pick tomato seeds, let them fully dry and after that using a Moulinex grinder (the ones that you pull 1-2-3) and make a tomato seeds flour. That flour has a strong compound of calcium, the calcium oxalate that is very solvable in water and highly absorbable by the root system. So I used that once (not on cannabis, but on peppers that have revealed nasty lack of calcium along their growth) and solved my problems, very very fast. So try this and you problems with calcium shortage will be end in few days.

Ya it's normal .. humidity can accumulate in some areas and not others depending on air flow and how cramped an area may be ... all should be ok just try to get better circulation in the area at 70%

You could: - defoliate lightly before the switch (a week to a few days). So they stretch a bit more. - Lollipop two weeks after the switch

Magnesium defic