Indoor Black spots?

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Indoor grow, Michigan M3 soil, 5gal pot, with 6.5 ph tap water. She was struggling and growing slow at first, showing signs of nute burn
Any ideas? New growth looks good

Temps were a bit high last week, around 80F with 50-70% humidity

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Ok then we need some information then to get going on this.

Please fill in this form: (copy and paste part is below, this first one tell what specifically to include)

-Problem: (brief description)
-Medium/grow method: soil; soilless-- coco, or peat based like Promix, etc. (please provide the actual product name); DWC, NFT, etc.
-Feed and supplements used: include brand, dosage/strength, frequency of feeding and watering (alone); method-- by hand, drippers, rercirc' or drain-to-waste,... N-P-K #'s too if you can!
-Water source: RO/DI; tap- dechlorinated-?..... EC or TDS reading; pH (don't bother with this on RO/DI, do bother with TDS/EC though to confirm it's working well enough)
-Strain and age
-Climate:
night and day ambient T and RH%; res' temperatures; any extremes in T/RH% exposure
- Light used: HID, LED, COB, combo of,... wattage; light cycle hours (20/4, 18/6 , etc.); distance to tops....
-Additional info: PH in the root zone. How long have the plants been affected?...How fast did symptoms appear?... Anything else you think might be relevant..

--Pictures including WHOLE PLANT PICS, and troubled leaves.. use normal light or flash as other light sources ruin color rendering, critical for diagnostics!

✂ - - - - - - - - - - -
(copy and paste)-->

Problem:

Medium/grow method:

Feed: and supplements used:

water source:

Strain/age:

light used:

Climate:

Additional info:
 
Problem: black spots

Medium/grow method: m3 michigan soil

Feed: and supplements used: living organic soil, just tap water ph'd to 6.5

water source: tap

Strain/age: CDLC by Mephisto - day 16

light used: 4x QB96 v2 in 4x4

Climate: 75-85F / 50-70% RH
 
Nothing to sweat on those first true leaves mate,.. likely a little fungal attack, necrosis, not uncommon at all,... the rest of her is fine! Nip them off and be done with it,...:smoking:
 
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