hey good journal, I have had some ph problems myself in the past, it is probably the cause of the yellowing, since you have flushed your plants, just put them back on your regular watering schedule, and make sure to properly ph the water from now on lookin good so far keep it up, by the way check out my grow, since you are near a walmart go to the sporting goods section and get one of those emergencey blankets line the inside of your box with it, you wont really need the reflector then