That's odd looking that the fade is occuring on those leaves before the larger ones -- light burn?
Were these outside before recently? If not, they may be reacting to significantly stronger light than what they can handle and would get pale and white from it on top.
Some glossy leaves, some cupping, and they aren't praying -- unless just recently watered or something. It's a slightly unhappy plant for sure. Hold off on nutes for a while, raise lights a bit if indoors. If it was recenlty exposed to the sun for the first time, bring it back inside.
Raise lights to 24" from canopy. Can slowly try an inch lower and see how it reacts in future, but this one will just be recovering by the time you harvest at this point, i'd guess.