RQS Northern Lights Auto small grow

Week 5 of flowering, this week the smell has started to arrive, I hope it keeps the current profile as its exactly the type of aroma i'm into. The plants have started showing these brown dots on some of the upper fan leaves, I kinda have a feeling its to do with the PH in the soil being off, but as it currently is, I do not have any way to verify this. It is definitely on the list of tools id like to acquire but for now I'll just see how it goes. I did try and give a bit more cal-mag last watering, just in case it would be deficiency on that part but I doubt it. Nonetheless, hope everybody is doing great and happy growing out there! :)