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Can be the begening of a nutrient excess & the burning tips is a sign , generally it's a fertilizer excess or a high temps issue that is causing the tips burnt. You've stopped the feeding and you've done well , you need to do a flush but not a big one as your issue doesn't looks like a big one and you they are already passed 5 weeks into flowering so if it is a 10 weeks flowering you should only have 3 weeks or 4 to feed before a flush so as long as she's not burning you can get back to the bloom nutrition after a quick flush