I don't think I over neut either but I really don't think this is a neut burn. More a deficiency. One site says iron which seems to effect the growing tips/new growth more than other parts of the plant. But why would I have an iron deficiency? Just trying to learn.

As for alarm? Sort of like if my daughter had a rash. I wouldn't just think it'd go away but see if there were something I could do to help her out. These plants are like my offspring. My kids. I'm like a mother hen always concerned. You know how it is.

Sorry...I didn't realize you were technologically challenged and using a monochrome monitor. Maybe this pic will help.