Friend, don’t worry at all. I think you’re growing under LED, and what you see on the leaves is a symptom of calcium and magnesium deficiency. If possible, use distilled or deionized water, adding only CalMag until you reach 0.4 EC. Then adjust the pH to 6.0. As for harvesting, ignore the information provided by the seed bank — you should really go by your plant’s trichomes. I hope this helps you with this and future grows