I currently use a 22 gauge, but alot of people have told me to use a 25 and alot have told me taht 25 is to thin and will be hard to get the liquid out or in, any advice on wich gauge is best to use and i use the same 22 needle to withdraw the liquids, but i am planning on buys 20 gauge needles to withdraw the liquid and then change needle, is this a good idea? thanks. :lift: