Plant discoloration identification help

Firstly, links don't work on Grow Diaries. Having a generic link to a diary isn't helpful either, post pictures of the exact plant you are worried about and pictures of the exact problem. Referring responders to a whole diary is tedious for us "question answerers". This comment is directed at all "question askers", not just you, but it is a common frustration. Secondly, post pictures taken in normal light, pictures taken under grow lights are hard to interpret. Thirdly, all your seedlings look fine to me, odd blemishes are quite normal on young leaves and not necessarily a deficiency or other problem - at this age and in fresh substrate, problems are almost impossible, most problems occurring due to over feeding. I would suggest any perceived problems may be the fault of this particular breeder, I have never had any luck with any of their strains and won't ever grow them again. Forget the lock out theory, this does not occur, in the true sense, until the substrate is below 5.5 or over 7.5, both highly unlikely scenarios. Keep donig what you are doing and I am sure the new leaves will be fine, if not, then you may have a problem, but at this stage, I don't think you have much to worry about. Remember too, no plant will ever have 100% perfect leaves, 100% of the time. Cheers, Organoman.

Well, the nutrient and watering levels are ok ( unless you water daily), so I strongly recommend you double your lamp to plant distance asap. The one you use is very powerful and the little plant can´t take it. Please consult the manufacturers instructions, they are quite helpful.