Im growing my third run of white widow autoflowers. Im currently 52 days from sprouting. The plant is flowering nicely but I found sone brown spots on one of the plants yesterday and im not sure if its a maganese or a phosphorus deficiency. The medium is happy frog mixed with 20% perlite. I use the fox farm trio for nutrients. 3tsp big bloom 2tsp grow big 2tsp tiger bloom 1tsp cal-mag. I feed the plants every other watering which is every three to four days. This is what I’ve done in the past runs and things went smoothly. The other plant in the tent is fine. The plant in question is due for a feed watering today and I’m wondering if should flush or it just need a goid feed for phosphorus. Any help is appreciated.
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It does appear to be the start of a phosphorus and possibly calcium deficiency. What’s your input and run off PH? For soil 6.2-6.8 is the range that phosphorus is best absorbed 
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Got a pic of the whole plant to share?
My PH is between 6.2-6.5. I will check run off PH today after feeding. Last watering was PH 6.5 and 1 tsp cal mag per gallon if water. This watering its due for nutrients and I plan on doing a regular feed with the nutrients I mentioned. With this being a bigger plant then the autos I’ve grown in the past Im thinking she may need more nutrients then I normally give. Thinking about instead of nutrients every other watering I will try adding a tsp of tiger bloom with calmag when I would normally just give it calmag.
Overall healthy looking plants Grow Bro and good to address issues when their minimal. I started with the FF nutrients and switched to jacks. They actually recommend a flush every 30 days or so but watering and feeding to ample run off will rinse the salts away from the previous feeding preventing a lot of root zone issues and the possibility of locking out nutrient absorption