What’s wrong with my plant?

Added some cal mag and they seem to be doing better, thanks!

Yellowing and browning of leaves in cannabis plants can be caused by various factors, including nutrient deficiencies, diseases, or environmental stress. To determine whether the issue is due to a nutrient deficiency or a disease like Septoria, it's essential to closely examine the symptoms and consider the plant's overall care regimen. Here's a step-by-step approach to address the issue: Examine the Leaves: Carefully inspect the affected leaves. Look for patterns of discoloration, the location of symptoms (e.g., top or bottom leaves), and any other visible signs. For Septoria, you might notice small, circular lesions with a dark center and yellow margins. Check Environmental Conditions: Ensure that your cannabis plants are growing in the right conditions. Make sure they have adequate light, temperature, humidity, and ventilation. Watering: Ensure that you are watering your plants appropriately. Overwatering or underwatering can both lead to leaf problems. Make sure the pots have proper drainage. Nutrient Deficiency: Yellowing and browning can be indicative of nutrient deficiencies. To rule out calcium deficiency, you can provide a calcium supplement to your plants. You can use a calcium-rich fertilizer or add calcium in the form of calcium nitrate or calcium carbonate. Follow the recommended dosage on the product label. Septoria: If you suspect Septoria leaf spot, you may need to treat the plants with a fungicide specifically designed to control fungal diseases. Isolate any affected plants to prevent the spread of the disease. Prune and dispose of infected leaves properly. pH Level: Ensure that the pH level of the soil or growing medium is within the appropriate range for cannabis cultivation. Cannabis generally prefers a pH between 6.0 and 7.0. Pest Inspection: Check for signs of pests like spider mites or aphids, which can also cause leaf damage. Treat with appropriate insecticides if pests are detected. Supportive Care: Make sure your plants are receiving adequate nutrients overall, including nitrogen, phosphorus, and potassium (NPK), and other micronutrients. Preventive Measures: Moving forward, practice good hygiene and preventive measures to minimize the risk of diseases and other issues, such as avoiding overcrowding, maintaining proper air circulation, and using clean tools and containers. It's important to address the issue promptly to prevent it from worsening as you transition your plants into the flowering stage. If you're unsure about the specific cause or treatment, consider consulting with experienced cannabis growers or a local horticulturist for personalized advice. Additionally, it's always a good practice to keep records of your plant care routine, as this can help identify patterns and potential issues in the future.

Looks like cal mag issue and potassium deficiency. You should really fill out information on your diary better. Like what you are feeding and how much. Without good info to go off of it makes it harder to help with a solid answer.

From the first picture it looks like it started off yellow and progressed to brown, anytime. I have dealt with calcium deficiency I have had brown spots in the middle of the leaves surrounded by yellow, but I have limited soil experience, just guessing if that's a long veg and could be N Good luck! Besides that looks great!

Are you fertigating? It looks like it could be n deficiency