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Hey man.
I don't know if it is calcium deficiency because that is seen on the top as well as the bottoms of the plants. Yours is at top only you said. Nonetheless, what is your soil PH? Are your lights far enough from the plants? Sounds like possible burning fro0m lights. What type of light you using including distance? Also what type and how often do you fertilize? How do the plants look today?
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