guys that weld with c02/argon mix

i have a small torch set up that i dont use any and was wondering if i could have 1 of the tanks filled to use with my mig welder???? i know i can ask the place that fill them but they are not open now and thought someone here might would know...i plan to buy me a big tank but right now i have this small tank and would like to try it out..i have never welded with gas before and want to start..i will pick up a reg. for it as well..i have did alot of mig work and stick as i have both but was told that once you learn gas you will love it..thanks mike