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[Dennishaynes]

[Mr.furley]

With the limited information you have provided, my best guess is ph fluctuation?

[Jacobs528177]

If your ph is in check, I'd guess calcium deficiency

[PRIMO]

If you're in soil, flush the hell out of it, last gal. 1/2 strength nutrients with cal-mag.

[Canuck147]

Spider mites