Are you in soil mate? I think you might have potassium excess, this will cause the top leaves of the plant to grow thin blades.
How is your water/ feeding schedule?
"Keep away from people who try to belittle your ambitions. Small people always do that, but the really great make you feel that you, too, can become great.”
― Mark Twain
i am growing in rockwool. It is the end of week 3 flower. I was on a 6 time a day water Schedule of 50 ml. But i cut that back to 4 times a day now. The Ph of the feed water is 5,8 and in the mats is around 6,1/6,2 first i thought that it was a nitrogen excess. And i started this week with potassium booster. So maybe thats the problem
And i started this week with potassium booster
yes mate, the likely culprit 
Just reduce it a little in the next feed. You monitoring EC?
"Keep away from people who try to belittle your ambitions. Small people always do that, but the really great make you feel that you, too, can become great.”
― Mark Twain
Thats really high mate...... Have you been checking the run off EC?
"Keep away from people who try to belittle your ambitions. Small people always do that, but the really great make you feel that you, too, can become great.”
― Mark Twain
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