can someone identify this?

Well I'm using floraduo a+b combo at a mild bloom. Full strength. With the recommended dose of calmag. Ph is steady at 5.8-6.1 not really sure what else it could be unless it's a spot where my lights meet and the footprint burnt the leaves. But it doesn't look like a light burn. Idk guys. Thanks for taking a look at it.
 

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