Mephisto Genetics Help identifying leaf issue

[Lil Dab]

Help identifying problem? This is my second grow and first me ph run. 5x5’ tent hlg 5x5’ r spec light. 6” inline exhaust fan. Two fans. 3 gal grow bag. OF amended with dolomite lime before planting. With HF is the center of pot. Day17 RO water only. I toped dressed pot with more HF a few days ago because plants were getting top heavy and were not rooted down far enough. And they stretched alittle out the gate. So I added more soil to support then and leaves my have touch dirt for a day at most could that be issue? Or mag deficiency? Or someone said septoria?

 

[Brownthumbs]

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-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: 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!

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Problem:

Medium/grow method:

Feed: and supplements used:

water source:

Strain/age:

light used:

Climate:

Additional info:

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