Lemon SSH (2nd grow)

Yup I have the same alot of people say that no 2 seeds grow the same but check out my biscotti grow 2 plants are identical size then you have a larger one. which i would put down to genetics. if you look at growers like leonsweed he grows seeds and they all look identical so if it were true that each are different how would you explain grows like that ? I think its more enviromental than anything maybe that spot in the tent has a higher temperture or the one on the left could be near the sold air intake which would make it grow slower. it could be genetics. just my opinion :) best of luck.

Some looks like mechanical damage from hitting the edge of the pot, some looks like damage from spilled water/ferts on the leaves. A young plant in fresh, quality soil is unlikely to be suffering from any deficiencies as yet. Remember too, no plant will ever have 100% perfect leaves, 100% of the time. I don't think you need to do anything or have anything real to worry about. High EC of run off is probably due to nutrient leaching from strongish soil mix. You might want to adjust the pH of your tap water, continuing to use it as is with a pH of 7.7 will lead to issues.