Beginning of Deficiency?

[Zootown68]

This is a Mephisto CDLC x GW plant 3 weeks in. Tupur Coco. General Hydro Flora Series week three feed schedule. Fertigating twice a day at 375 ppm at 5.9 pH in 3 gallon pots. RH 75%, Temp 70. 18/6 lights Viparspectra XS 1500 at 20" at 75%. Overall color looks lighter than it really is, but it's the lighter spots that caught my eye. Plants are just now starting to look perky again after transplant shock, but this discoloration is new.

Any ideas right off the bat? Thank you thank you!

 

[Builder0101]

375 PPM of what? Are you correcting for base water PPM? I suggest filling out the form found in this infirmary thread. You find it at the top b4 your post.
Why are your temps so extremely low?

 

[low_and_slow]

How are you mixing your GH?

Runoff pH?

 

[Zootown68]

375 PPM of what? Are you correcting for base water PPM? I suggest filling out the form found in this infirmary thread. You find it at the top b4 your post.
Why are your temps so extremely low?

My temps are around 70 degrees. Starting RO water is +/- 50 ppm. Thank you, I'll fill out the rest of the data.