1. You have been over watering. 2. If you are using nutrients stop using the micro and let your tap water take care of it. 3. Let your medium dry out. 4 When you water again use 1/2 of whatever nutes you have been giving your plant. Just a little bit not much. 5 IF YOU ARE GROING IN SOIL DO NOT PH YOUR WATER period. 6 ..If you are growing in Soil inside it is best to make sure that you let your water sit for at least 2 days so it can gas off really good and not kill your microbes . There are other products to adjust the PH in soil. DO NOT USE PH UP AND PH DOWN designed for hydroponics .IT WONT WORK. 7 . Cannabis is a WEED and it can grow in soil that is PH up 9 or so just Fine some say your yield will not be as good but what is good is a matter of opinion. Buy a Copy of the MARIJUANA GARDEN SAVER ON AMAZON and continue to read and post on this site and YOU WILL GET THROUGH THIS.. GROW MAN GROW.. ( this post is the result of smoking a fire ass Sativa at 2:30 am..peace)