E-juice refill in protank 2, when I turn it upside down to fill, I can see rather dark trails sliding/floating thru the juice from the wick. This is only happening with one flavor of juice, never with any of the others I have. Its Halo Tribeca, and its happened since day one i bought the bottle and used it in my protank 2. Is this normal? I got bothered by it a couple weeks ago, stopped using it for a bit, then with a fully washed and dried PT2 and new coil head, filled the thing up and it works. Just turned it upside down to refill and see the same gross looking brown going thru the golden colored e-juice. Its kinda killing my interest to use this in a protank. 