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Any ideas on what this could be? The plant is doing pretty well. This appeared overnight and want to prevent it getting worse
 

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@BigB6 :welcome:Welcome to AFN:welcome: Could be a couple of different things.

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! Turn off the grow lights.

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

Problem:

Medium/grow method:

Feed: and supplements used:

water source:

PH in the root zone:

Strain/age:

light used:

Climate:

Additional info:
 
Problem: Leaf discoloration

Medium/grow method: Plagron Batmix

Feed: and supplements used: Just Plagron power roots

water source: Tap dechlorinated. I'm not checking pH as it says there's no need. I check every now and then and is fine

PH in the root zone: don't know. I don't check pH as it's usually around 6.5-7 from tap.

Strain/age: Fastbuds bluedreamatic

light used: Attis 300w, 18/6

Climate: 24oc celsius, 55%

Additional info: The symptoms appeared overnight.
 
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