HPA or LPA on the Invert Mini?

i'll be getting an Invert mini this Thursday, and i was also going to get a new HPA/LPA tank (was using a steelie tank) and the store owner told me that HPA makes the tank harder to unscrew from the Invert Mini and will make the Regulator/ASA loose or break (eventually), is this true? if so i'll probably put some extra cash for a LPA tank.