any input would help kinda of confused

Anyone know what this is maybe K def?

got more pics , whats your feeding ? need more info !

N? doesnt look like a mag def

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I'm thinking N or P. You should def feed them. But then again I don't know anything else about your grow just basing that on a picture. Good luck

yea could be , i was thinkin potassium or calcium , but id have to see more to know ...

its not N the plants are 4 weeks into flowering... feeding 1/4 teaspoon of dyna grow bloom with open sesame for 3 weeks and last week used beasti bloom in fox farm happy frog soil watering with RO with Calmag using water feed water feed type schedule...

try a good flush with 1/4 nuti , could be salt build up ,,, how close are yo lights ?

i had a nute lock situation i caused by letting the soil get too dry between watering looked just like a mag dif.