Single YELLOW DOT. Start of WEEK 3

It is nothing, you are over thinking things. No plant will ever have 100% perfect leaves, 100% of the time. Make sure to keep water off of the leaves, this is the most likely cause of that one tiny yellow dot. Westlands advertise that the compost you are using has enough "goodness" in it to provide feeding for up to 5 weeks. Don't fertilize just because you feel the need to "do something". Remember, it is very easy to fix a slight under feeding but very, very hard to rescue a burned and damaged over fed plant.

Your medium might not need any amending till it is 3 weeks old. The stuff is comprised of Loam "a type of topsoil" and BIO3 a wood product of some sort that mimics peat moss. It seems like it has enough food in to last a while. The company does not list is NPK on the bag but it has stuff in it. Maybe shoot them a email and ask for its NPK breakdown. You'll want to mix in the amendments in the top layer and water it in. I find mixing 4-4-4 and 2-8-4 in a 3:2 ratio gives ideal NPK Good Luck!

Honestly I think everything looks good. Was checking out your diary and I think you are right on track for Northern Lights. I would not change anything at this moment. Week 3-4 is a good time to add amendments so I would continue with that plan. It could honestly be a small bug bite…? Again, at this point not worrried. If you see any other issues feel free to upload another picture and we can further asses what might be going on. I hope this helps and good luck with the grow!

hmmmm strange one i would not worry too much if the plant is still growing fast enough probably do more harm than good trying to solve it at this stage she is still quite fragile. Id just wait if I were you. but could be a slight imbalance in ph or your feed best of luck buddy