Yellow and slight burn on small plants - help appreciated!

Week 2 is early for a nutrient deficiency unless the ph is off. When leaves are too close to the light, they react within about an hour by cupping the leaf edges, and if left unchecked (and if you're using an LED) you'll begin getting bleached leaves that are pretty distinctive. Some nutrient deficiencies can look like nute burn early on. Check your runoff ph. If that's off, flush and correct your ph. If you aren't getting leaf cupping and bleaching (assuming and led grow light), your light isn't too close. The symptoms look like a magnesium deficiency, but if its showing up in week 2, I'd check and correct ph before adding Cal Mag. After doing that, then add a little bit of cal mag (1/2 strength). If it is a Mg deficiency and that fixes it, it won't undo any damaged leaves but you won't see it spread further or worsen. Some people do add a bit of Cal Mag early in every grow, but this early you shouldn't need it with good soil, so I'd check runoff ph.

Hey buddy ;-) The humidity has to be higher ;-) Your Ph value is just fine :-) How much is your Ec worth :-) there is a very simple trick when you give water. Let it dry nicely, then lift the pot up and remember how easy it is. Then pour it and lift the pot back up and notice how heavy it is now. The next time you water, you will only do it again if the pot is as light as when you started. As a pure beginner, you can also use a scale and note the weight ፦). Keep carrying as before 👍 Your plant is beautiful