Weird thing happened. I've got 2 tanks, both setup identically, this morning, when I woke up, the liquid in one of them had turned black. Not entirely, but extremely dark, (can't see through it at all) Originally it was a tastyvapor peach/vanilla blend with 10%VG. Is this something going wrong with the carto? Odd think is, the other tank, filled from the same batch of juice at about the same time is fine, a nice clear amber. I'm going to dump this cart and the black juice, but I'm wondering if anyone knows what might cause this?