What kind of deficiency/problem is this?

[ttttttyler]

it appeared on the relatively lower parts of the plant(not new grow leaves but also not the bottom leaves), so I can not tell if it is mobile or not.

 

[curious2garden]

it appeared on the relatively lower parts of the plant(not new grow leaves but also not the bottom leaves), so I can not tell if it is mobile or not.

We need a picture of the entire plant, nutrients, substrate, light information etc...