Deficiency or environmental?

if any lower leaves have necrosis, Fe def Zn def, since i didn't mention which before. starts at top, from in-to-out on leaf. A slightly more acidic soil will help with both Fe and Zn without changing anything else, too.

Looks like zinc, but check pH first. that's more often a cause of trace element issues. If you use RO water, switch to tap. That may fix the problem with the trace elements too. (some exceptions for hard water > 300ppm)