Stickanswered grow question 7 years ago Hi there! I'm thinking about a PH issue in the past weeks that results today in a Manganese deficiency. I've never experienced such symptoms at this stage whereas I'm also using BioBizz nutrients, and I usually stop Nitrogen (BioGrow) intakes just after the stretch peak, so around 12-15 days before you. Plus, your leave's tips are already burnt, that makes me think you overfed them in the past. As an emergency move, I would flush the soil with plain PH'd water for 2-3 days water before going back to giving regular doses of blooming/flowering nutrients. I'll be around, keep us up-to-date so we can help you to adjust any parameter if necessary, and good luck!