I have a six gallon res and ph is constant 5.6, I just switched to 12/12 and recently started a thread because I suspected my plants had root rot. It ended up me just overreacting cause this is my first hydro grow. I was wanting to find out how much of the H2O2 I should be adding to my res when I change the water out everytime. I flush the res consistently out once a week and have been since they were about two feet tall. If someone could help me out it would be much appreciated.