Phosphorus deficiency?

Bump anyone? Though this was nitrogen def. then fungus gnats. However after giving more nutes the problem has stopped.
 
Looks similar to problems I have been experiencing, I got a confirmation of P def so would assume as nutes has fixed the prob, applies to you too :D

EDIT- I read online that those effected leaves will not be able to get back to full greenness, so keep an eye on new growth to be sure you have corrected the problem!
 
It's always best if you take a pic of the WHOLE plant and then the AFFECTED area and don't just pull a leaf and show that!
It actually tells us little to nothing!

If that's P def. ,,, you have other more major problems that are causing it......

Pics of the whole plant please!
 
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