Problem w/pics

I'm on day 3 of 12/12, and switched from a MH to HPS bulb. I had some heat stress the first day from light distance. I changed that up, but have noticed 1 plant (the tallest) has started some discoloration on some of the top leaves. Today I noticed more slightly further down. It's not much, but is the start of something. I'm in Roots organic original soil with lime, perlite, and ewc added. Using the full line of EJ nutes between the light and medium feeding recommendation. Overall the plant looks good. I just want to catch my problem before it gets out of hand. Here are the pics.

Anyone?

I wouldn't be sweating that but I'm no guru.

I really don't see anything to sweat out either. New growth looks good.
Keep going.
Pic 2 shows "possibly" the begining of a Mag. def. But like I said the new growth looks fine and the overall pic looks good.

Keep on top of your ph/ppm and every ing will be fine. Like everyone said prior everything looks good.

it looks fine stop trippin

Just a lil nute burn I get it all the time with the soil i mix. I use AACT to correct any over nute symptoms.

Thanks all. I was thinking it was a possible overferting problem since I dropped in some extra EJ Grow to the last feeding before the flip to 12/12. I'll use an EWC tea for my watering in a couple days and see how it goes from there.

Fangule said:

Just a lil nute burn I get it all the time with the soil i mix. I use AACT to correct any over nute symptoms.

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Those are Very small burns ( under 5% ) You have plenty of room to fix and not to worry! Thank you for showing us! We love to help.
Like up top, just keep track on you're Nute intake and test it out. You have plenty of wiggle room here to experiment and be a Scientist

Fangule said:

Just a lil nute burn I get it all the time with the soil i mix. I use AACT to correct any over nute symptoms.

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Yes this is right. Salt burn from soils and soil mixes. To avoid this use a quality coco mix and hydro nutes made for coco. Nothing much to worry about here atm.