Hi i was wondering why my ph keeps rising. I mix up a full tank to (20L) to 5.6 and by the end of the day its up to 6.1. I have been taking it down with some PH down but i understand its not good to add too much or you will poison your plants. Also i hae noticed my leafes are drooping a bit towards the end of the day. The plants are in clay pebbles in ebb n flow system. Neuts and all that are spot on. It looks like over watering but i only flood the table ebery 6 hours. However the plants are still only about 8" so is this too much?