(DWC bubble bucket no reservoir)I'm in beginning of week five veg. End of week four changed my water also went to stronger blend of nutes. Day later my roots are light brown-dark brown in some areas. Two days now still colored. The roots were pearly white before this change out(Ppm@1220) what happened, can it be fix? Should I worry or move on? H2o2? Also heard to leave some water in the bucket on change outs?