Hey guys, my girlfriend just broke her tank that came with her Istick pico. She already had lots of trouble with it and was going to get a different one anyways. I have an Eleaf Istick 40watt and use a kanger tank with .5 ohm occ coils. Would that be safe to use with her Istick pico as well? Also, what other type of replacement coils are Safe and compatible to use with the istick besides OCC coils? How do I know what coils are compatible and will fit my vape?