Take some pics so we can confirm the hermie I would bet that they are just unpistilated (is that a word? ) calaxys, I've never had a hermie show that early before anyway. Hermies can drastically reduce yeild (both in quantity and in quality!). If you wanted some better smoke, since you're growing it out regardless, you could patiently pick each hermie male flower off. Time consuming but I dont know the amount of effort you want to put in here.

Otherwise they look pretty healthy except for the yellowing. You're runoff is crazy though! If you're putting in seven and getting out five you're way out of bounds on the low side. I would throw some lime (like 1/4 c hydrated ) in your next water batch. It will raise your soil ph while making sure it doesnt go over 7. Be careful as you can toxify plants with this, so use it with one watering and check your results. It can also be flushed out quickly if you flub up too, so it should be a good way for you to identify your problem.