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How close are they to lights?
How old are they?
Are you using nutes?
Soil or hydro?
I'm not sure what the problem could be, but I'm sure that more info would help people answer your question.
It could be anything from light burn to nute burn to a nute deficiancy based on that pic (and my limited knowledge of sick plants).
My advice would be to possibly stop any nutes you're giving them and just give them plain water. But moreso you should probably give a little more info so we can help you more.
^__^
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