Indoor Brown spots on leaves

[Don Manzoni]

Hi guys.

-Problem: the older leaves on my 2 red poisons are getting yellow with some brown spots, i have other plants that are getting the same feeding schedule that aren’t like this.
-Medium/grow method: Soil, all mix from biobizz.
-Feed and supplements used: biobizz organic > (fish mix 1ml, biobloom 1ml, top max 1.5ml )/L > every 4 days.
-Water source: using tap water, balanced ph 6.5/6.8.
-Strain and age: Red Poison from sweet seeds, 7 week old.
-Climate: day / night > ± 29C / ± 24 with RH ± 50 to 65.
- Light used: LED 100W with ± 20 cm to the top. 18/6.
-Additional info: it started very slowly on the older leaves a week or so ago, on both palnts. I have another genetic plant in the same tent that is getting the same schedule that isnt affected.

--Pictures:

 

[nizmoKush]

To enable a quick response to your plant Problems we need You to provide some Basic Information.

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: 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:

 

[skeeter456]

Following

 

[Peacefulgarden]

I would test runoff for ph and ec and see what is happening inside your medium.

 

[Tom Bombadil]

Seems to be a pattern taking shape with biobizz from what ive been seeing for some time now.
"my leaves are doing x"
"soil: biobizz"