Help I cant figure out what's wrong with my plant!

Hello, I have been growing 6 plants all from the same strain and seed. I am growing in coco and I am feeding with general hydroponic series. I feed all 6 of my plants with the same exact water and food. Ph is generally from 5.8-6 and ppms range from 500-600 after I make the food. I also use cal-mag. I decided to do some LST because my grow tent isn't very tall and one of my plants took it bad. The leaves are discolored and I can't figure out the issue. I used the same exact food and water on all my plants, but only one of them took it bad. My temps in the day time are around 70F-78F and at night range from 64F-70F. I always test runoff and ppms after every feed and the runoff is always in optimal range. I could use some help and thanks again.

It looks like it’s recovering from trauma of some kind

Can I ask for a better photo please? How big is the plant? and How many weeks in veg are you? What size pot and do you know how much water this particular plant received?

I may be wrong, wont be the 1st time, but I think the temps are to low, and possibly affecting Magnesium, and also possibly Calcium uptake. Id up the temps to 78f-80f in the day, and 73f-75 at night.

Highlife42 said:

Can I ask for a better photo please? How big is the plant? and How many weeks in veg are you? What size pot and do you know how much water this particular plant received?

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Yea plant is 4 weeks into veg and I have them in 3 gal fabric pots. I dont know how much water I put in on the initial feed but I stop at around 10% runoff. I feed every 3 days when the pots get light and the coco on top dries out. The plant is about a foot and is the smallest out of all my plants. The rest of my plants have 0 issues, only this one did.

Ok. I think your plants are too small to be having any runoff. I believe you are washing out Phosphorus. Phosphorus is a limited mineral in soil anyhow, but also limited in how your plants roots uptake P. It has to convert and become bioavailable. Your micro-nutrient concentration is low. What nutes are you using? and how much if any so far?...EDIT- saw your nutes from OG post. I would back off cal-mag. CAL-mag does this a lot when not used in very small quantities.