If you look at my grow log you will see the same issues.

You are lacking Cal-Mag. You need it plain and simple. You are also putting in to little nutrients. You should not ever need to use PH up ever, if the correct nutrient amounts have been added to your res with Cal-Mag. Especially if you are flushing this often. Even when you are flushing, you are not giving the plants the necessary nutrients of calcium and Magnesium and other essential minerals found in CAL-MAG plus.

Go to the hydro store sir...and cut the dead under leaves off...the ones being effected with brown spots will be fine once you start adding a cal-mag regiment. You will probably need to be adding 10ml per gallon.

Good luck!:jointsmile: