Yellowing on leaves and some brown spots

I'm going to say you have a sulfur deficiency and calcium deficiency but your also getting some natural fading because your pretty close to finished...If you see rust colored spots and green leaves next time it's your calcium and same goes for sulfur, rust spots but yellowing...I wouldn't do anything right now but check your trichombs and if you got 80 percent cloudy, chop them down, you'll be at peak THC, of you want a bit of couch lock let them go amber and the more amber ya go the deeper the couch lock gets...Best of luck Calcium is very important to cannabis plant growth. Factors like early root development, nutrient uptake, developing cell walls and membranes, plant transpiration, and robust flowering. An immobile nutrient, the plant will first show symptoms on new growth, such as yellowing and deformed leaves. Yellow & Brown spots will begin on the fan leaves. In severe cases, necrosis will increase & leaves will die out. The plant becomes susceptible to powdery mildew and pests when calcium is low. Can be caused by: • Improper/low pH • Nutrient Lockout • Phosphorus/Potassium Toxicity • VPD out of rangeMake sure your pH is balanced, re-apply a new nutrient mix if necessary. For Coco: Ensure Coco has been buffered with Ca/Mg. Without buffering, Ca and Mg deficiencies are more likely to occur. Organic Solutions: • Egg Shells. When crushed in soil, it will a be a slower release. However, crushed egg shelled, warmed up, mixed with vinegar (1:10) as a foliar spray will be a much quicker way for your plant to recieve calcium • Dolomite Lime • Organical Magic Sulfur is a secondary nutrient, essential for the formation of proteins, amino acids, and chlorophyll which is part of photosynthesis. Symptoms of sulfur deficiency present as pale green and yellowing leaves starting in new growth throughout the plant, as it's a semi-mobile nutrient. Necrotic and drying spots throughout the leaf, the edges, and the tips. In severe cases, the plant's growth will be stunted and spindly. Can be caused by: • Improper pH • Nutrient Lockout • Out of range VPDFlush your plant and reapply accurate, balanced nutrients Before adding supplements to a plant's root zone, check the pH level of both the soil and/or the water solution (especially hydroponics) for plants. If the pH is high then it can be helpful to buy and carefully use a sulfuric acid-based fertilizer to both re-introduce sulfur, as well as bring down pH levels. If pH is within a normal growing range (5.5 to 7.0) then using Epsom salts would be a good source of sulfur for watering/hydroponics. In soil-based grows or outdoor grows the use of gypsum is good for sulfur introduction, but you may also use sulfate-based fertilizers such as ammonium sulfate or calcium sulfate, among others. If you have access, manure could be a great organic option as well.

Hey mate, it's looking good. Well if you look at the plant, the plant is covered in Amber trichomes. The reason the plant is doing this is because it's nearly ready for harvest. Just give it ph'd tap water for the next 5 days and then on day 5 chop it down and hang it up to dry in complete darkness at 70%RH for the first 3 days, then down to 40%RH for 5 days and then it should be ready for curing in the jar when the outside is crisp but firm.

I think your substrate ph is out. Topmax is nitrogen heavy & auto's can't tolerate the feeding chart of photo periods. You may have lockout from to much nitrogen nutes. Try 2 water feeds & test your run off before feeding again & bring that topmax amount way down. Goodluck