Rust spots on leaves

Hello, I‘ve seen that you just started using cal-mag and big bud coco wich is good because they contain important trace element‘s that are not in DualPart Bloom or Grow. Magnesium is an essential ellement for photosynthesis wich will help alot. I also calculatet your npk and In Total you have 185mg/L Nitrogen, 230mg/L phosphorus and 245mg/L potassium. The levels of phosphorus are high but do not often lead to toxicity unless you are not ph balanced. The second problem with high phosphorous is that It hinders secondary Motabolism aka cannabinoids. It can help with plant groth but only up to 90mg/L wich is way below. I would recommend you to read this study because it would be very beneficial! https://www.growweedeasy.com/phosphorus-toxicity-cannabis Your biggest potasium intake is the DualPart Bloom wich I assume weighs about 1Kg per 1L. The P concentration is 5% so you have 50g of Phosphorous in your fertelizer. 0,004 (4ml of 1000ml) times 50g = 0,15g or 150mg/L of phosphorous. I would cut that in half and cut the Big Bud Coco wich has 80mg/L of each phosphorus and potasium. You also don‘t need that much potasium in flower, wich is proven by diferrent studies. After that your NPK would be: 175mg/L N, 115mg/L P and 160mg/ K. Contraty to popular believe Cannabis does need Nitrogen for the stretching phase because it nearly grows double in sice. To highten the N and the K a little bit more you can use 0,5 ml more of the DualPart Grow. In the end you‘ll have a great balence of nutriens with an exact NPK of: 200mg/L N, 115mg/L P and 185 K. Imo a litle bit less P would be good so for that you‘ll need to cut the Dual Part Bloom to maybe 1 ml. This would mean just a third of it wich would give you: 195mg/L N, 90mg/L P and 170mg/L K. To back my claim up that this is optimal, here is a reaserch showing it: https://www.frontiersin.org/articles/10.3389/fpls.2021.764103/full The final recipy is: DualPartBloom 1ml/L DualPartGrow 2ml/L Big Bud Coco 1 ml/L Sensi Cal-Mag extra 2ml/L I can guarantee you your EC will be spot on. 💪🏻🌱