So i just went to a local company that sells all kinds of different types of gasses and I asked for beer gas..the guy came out with a CO2 tank so i told him no i already have that i need beer gas is a mix of nitrogent and C02 so he asked me what i was trying to do so i told him i need if for a Guiness i made and i wanted to get the pour that all draft Guiness get and he told me that nitrogen would not do it, so me thinking he did not know what he was talking about i asked him again for the mix and he gave me a tank that says daft blend Carbon dioxide\NOS and at the bottom it says Nitrogen \ Carbon dioxide..so hooked it up and he was right i am not getting the famouse Guiness pour..its looks just like a regular draft beer...what am i doing wrong..did i get the wrong mix?