2018 First Grow: Auto OG Kush

With added 300W the day temps goes up to 30.5C. My exhaust fan is too small to take all the heat out. Will replace it next month but for now, I keep the window slightly open and let the tent take cold air in. Which stables the temps to 28C inside the tent. Another small issue, which happened to all grows, I watered them couples times from the wrong bottle last week with pH over 7.5. Thats why ( I guess ) they couldnt get all the nutes and some leaves turned yellowish. I looked it up seems like lack of some minerals. Not sure, might be something else but this seems logical explanation since I gave them wrong PH over a week. Anyway, as a solution I flushed (not completely but slightly) to get the right pH level again. Flushed in regular watering day and gonna feed on regular feeding day again. So the schedule didnt change. Also I read somewhere in the forums that some people flush in transmission phase too. So I thought it wouldnt be much problem, also as said, I didnt fully flushed. Just lets say, %30 of the water came out from drainage holes.