Leaf discolorations, I think I know but wanted to verify

[DevilDog_0651]

Plant: Power Plant by Growers Choice
Age: Started February 1st, so about 4.5 months old
Stage: Flipped to 12 and 12 3 days ago
Medium: Fox Farms Coco Loco
Nutrient Line: Grow shop's own line, but there is a veg nute, cal+mag, body builder (silica product), and a smart tea
Feed pH: anywhere from 6.0 to 6.8 (Coco loco states 6.3 to 6.8)
Feed PPM's: Anywhere from 650 to 1200 (Not sure where my PPM's should really be, and don't quite understand what I'm looking for)
Feed cycle: I feed every time I water, which is anywhere from 4 days to 7 days depending on the look of the plant (I normally wait until leaves are starting to droop and the stems are not as hard)
Temps: Anywhere from 66 to 90
rH: I don't really monitor
Where She's at: In a shed in my backyard
Climate Control: I have a little 4.5" axial fan at the top of my shed to attempt to suck out hot air. I have a 12" Hurrican fan to move the air around
Lighting: I just upgraded from a ViparSpectra 600w blurple LED to a Mars Hydro TS 3000

Issues: I am starting to see what I believe to be a possible Potassium deficiency, as well as a possible calcium + magnesium deficiency. Please look at my pics and help me out! Thank you!!!

 

[derek420colorado]

The first pic just looks like some kind of weird leaf gene thing. The second i think might be thrip damage. Have you checked suuuuuuuuper close for thrips. They are small and hard to spot. I wouldn’t worry about the odd colored part of the leaf unless it spreads. If it is thrips I would either use diotomacious earth or get some assain bugs or praying mantises

 

[Mañ'O'Green]

I agree with a minor Potassium deficiency as the culprit. I don't know how to increase P with what you are using. Remember that PH can cause this as well. Do you know the PH in the root zone? You need a good soil probe to determine the PH. I recommend an Accurate 8 or the clone. More pricey but a great tool is the Blue Lab PH soil probe. I know nothing about the nutrients you are running so you will need to seek more information about that. Perhaps you need to pick-up a P-K booster and use just a little.

 

[DevilDog_0651]

Thank you all for the responses. I have switched to my bloom nutrients, which obviously have a higher ration of phosphorus and potassium. Is that the "PK booster" you're talking about @manogreen?

 

[DevilDog_0651]

Derek - I checked and I do not see any sort of bugs on my plants, or in my shed (other than wasps)