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Brown spots on leaf

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Hey everyone I noticed these brown spots on a few leaves any idea what it could be. I have not been supplying nutrients and I do not know the PH of the soil. The plant has 3 CCFL's and is getting constant airflow.

Any help would be appreciated.

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Two mistakes
1. not supplying it with nutrients and
2. not knowing the pH.

It looks almost like a boron deficiency which is rare [I have never seen it here on the boards that I recall] or it is some kind of mold/fungus.

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