Discolored lines and spots on leaves (young plant)

[TonyGr]

Hello and Merry Christmas! I have a small (so far) problem with my new baby. Info as follows:

-Problem: As shown in photos there a couple of discolored spots, many discolored small (4-5mm) lines and a big one (about 1cm). First true set of leaves are a bit curved at edges. All leaves affected more or less
-Medium/grow method: Soil. 20% Biobizz Light Mix (top), 80% Biobizz All Mix (bottom).
Airpot 11 liters
-Strain and age: Blue Cheese Automatic (Royal Seeds Queen), 13 days old
-Feed and supplements used: Root!t First Feed. So far I watered four times, always with R (1st 2ml, 2nd 2ml, 3rd 3ml and 4th 4ml)
-Water source: First three times watered with tap water mixed with some rain water. I left it for 8 hours to dechlorinate (just in case). pH adjusted using lemon juice around 6.5 to 7 pH. Fourth time watered with nice rain water 6.8 pH.
No EC/TDS meter available so far
-Climate and Light Schedule: So far light is always on to keep stable temperature (18-22 Celsius). It’s winter and my growbox heater is still on the way. Will switch to 20/4. Humidity 55-60%
- Light used: 1st week 1xCFL 40W 2680lm 6400K. Then changed to 1xLED 18W 1850lm 4000K and 4xLED 12W 980lm 3000K. Distance to tops 30cm
-Additional info: About watering, 1st time watered 150ml, 2nd 250ml, 3rd 340ml (no runoffs so far) and 4th 900ml with some runoff
All leaves are affected more or less. First thought was wind burn. I was using 2 PC fans (140mm) pointing near the plant just to shake it a bit 24/7. Now I use one fan pointing growbox side few hours per day. Second thought is some pest invasion. Haven’t seen any bugs so far. I assume they are too small to spot if any. I keep checking.

First four photos are a bit reddish. Others have nice actual colors.

Thank you in advance

 

[namvet25]

Nothing to worry about.It should clear up when new growth comes in but if it keeps up let us no.

 

[TonyGr]

You are right. Newer leaves seem unaffected. What caused it? Thank you for your answer and Happy New Year

 

[namvet25]

View attachment 845915
You are right. Newer leaves seem unaffected. What caused it? Thank you for your answer and Happy New Year

Could be a little nute splash left on leaves during feeding.Some times you will see a flaw here and there but this is normal and usually goes away so not to worry.Other than that your girl looks great.

 

[TonyGr]

Could be a little nute splash left on leaves during feeding.Some times you will see a flaw here and there but this is normal and usually goes away so not to worry.Other than that your girl looks great.

Great. Nute splash. Never thought about it. Thanks again!

 

[Waira]

... not a nute splash thing... new leaves like that can show some odd things occasionally, I can't say what's behind it either, but when so minor, and not progressing or showing up on other leaves as they form it's nothing to worry about,.. as you see it all stopped-