PPM going up

You need to change your water, and clean out the system once a week ideally. Also an auto fed at 1200 is quite high. I still would lower the feed down to 600-800 You can see the starting of what I feel is nutrient burn on the tips of the plant in your diary. You where using 300ppm for weeks 3 and 4 then jumped up to 1300?? why such a drastic hike? I use this link a lot, its a good reference point for feeding autos in hydro. https://www.autoflower.net/forums/threads/med-man-method-feeding-chart-ppm-ec.47856/ Best Of Luck!

i search on youtube about change water is neccessary www.youtube.com/watch thanks Grey_wolf for answaer my question