CZ420CZanswered grow question a year ago Its bad PH, 6.3 for substrate isnt good. Raise PH to 6.5-6.8 - when adjusting pH, you can aim for a different value with each watering. For example, you can adjust your pH to 6.2 for one dressing and 6.6 for another. If you stay in the 6.0-7.0 range, everything should go according to plan. Check run off PH, Biobizz lowers PH