Nute burn?

I’d go straight water for a few feedings till you see growth happening.. If you think it’s burn you should give them a good rinse.. over flow a couple times with straight water.. it don’t look like you over burned them they honestly don’t look too bad.. look at my week 3 or 4 if you wanna see bad burn.. lol .. Good luck

Baby plants need baby feeding. Giving these young plants full strength nutrients is like giving a three month old baby child a T-Bone steak for dinner. Also as esoteric growing said , your soil mix should have enough goodness in it to last your plants for the first 3 weeks or so. Once your plants have 8 nodes or so is a good time to start feeding them, starting with quarter strength nutrients to see how they accept it. If all goes well and after about 10-12 nodes, maybe then go up to half strength, which is probably the maximum strength to use in general. Plants in my experience seem to perform best with regular weaker (half strength) feedings once established, than they do with heavy (full strength) feeding less frequently. If you think about it as feeding coming in at gentle waves (half strength) rather than high peaking waves (full strength), which can overwhelm a plant. Remember too, it is far easier to correct a slight under feeding than it is to rescue a badly burnt over fed plant. So, at first, go gently with the nutrients, plants at your size need very little. Trying to speed up/push their growth with high doses of strong nutrients will lead to unhappy plants that will then require weeks recuperating, slowing growth much more than if a gentle feeding regime had been administered. Hope this helps,... Organoman.

Early to say but after zooming in it looks like it may have just started in the first pic, slight hint of tip burn but it’s hard to see especially so early so could just be the camera angle. Normally in soil it would take at least day to see any reaction to a feed unless something was really wrong. Does the soil not already have enough nutrients in it to feed the plant for the first 2-3 weeks? Normally on a bag it will say the strength. I normally use bio bizz all mix soil and it has enough feed to last about 3 weeks and just give it water for that time and maybe a root stimulator etc.