What Is This Problem? HELP w/Pics

These are Sweet Cindy's non-feminized and are 4 weeks into Veg. They are in hydro buckets feeding on Flora series (half-strength) of recommended. The ph of the solution is between 5.0-5.5, room temperature 75F with plenty of air movement. Can someone who knows what this looks like give me better details on what it is or might be? Not all the leaves are like this but this leaf shows the most signs of it. If you look closely you can see that the edges are showing signs of something. Any help is appreciated, thanks.

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is there a hole in that leaf? a tiny one toward the niddle left?


im gonna GUESS high N, for the edges being a bit deformed.
 
ph solution is 5.5

whats that mean? the water that your using, after adding the nutes, is 5/5.5?
 
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