protank is pretty good, i got one but i dunno if its the liquid or the wicks, im having to topup twice a day lol. or maybe i just use it too much? either way, tastes good
Top up twice a day? As in using a full 1.5ml twice?
It'll be the coil, most likely a 1.8 ohm, buy some 2.2 or 2.4 ohm units, they'll last longer and not burn as much liquid.