Is this chemical burn?

No, it's hungry. That's phosphorus deficiency, 95%. Looks like nute burn but it's the exact opposite. Feed it.
 
Without knowing what you feed and how much, in detail, it's hard to say whether it's deficient or locked out, but seeing as you're in mid-flower, i'd say she's telling you...give me some more phosphorus, or im killing myself:)
 
Without knowing what you feed and how much, in detail, it's hard to say whether it's deficient or locked out, but seeing as you're in mid-flower, i'd say she's telling you...give me some more phosphorus, or im killing myself:)
Agree all the way. Why the hydroton?
 
How far along are you into flower and how many weeks do you think you have left before harvest? The answers will tell you what to do next.
 
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