Hey guys I have had this evod kangertech starting kit for a while now and have never had any problems till about a week ago, when i fill up the tank, (with a new coil aswell) and smoke it for a while the juice inside the tank starts turning brown, is there a way to fix the coil that i already have, should i be using other coils, i know you can make cotton wicks for them and dry burn, i just want to get soem advice before i get my hands dirty trying to improve this thing and possibly ruin a coil.