Regulator and Nitrogen tank issues

[Athina_99]

Okay so I feel like the forces are against me. I purchased another regulator flowmeter one I had seen another person post and suggest from Amazon for $39. The first one with the clear plastic and ball, because the 2nd one did not have a strong flow and the second one cost over $100. Anyways I went to try and test new one on 20cf aluminum Nitrogen tank which last time I tried testing it had 1000psi left in there. This time the tank was almost empty and when tried to screw on flowmeter it wasn't going right enough and drained more. Do aluminum tanks drain just sitting there? I am freaking out. I truly am. I have purchased a 55cf aliminum tank to come tomorrow and I don't know what to do now. It is over $400 which I don't have. Neither of these regulators are working properly and why is the tank drained or draining so fast if wasn't used? The flow isn't strong. When I first put on the new regulator flowmeter I couldn't get it tight enough but still when got it at a flow of 30cfh or whatever it is, it was barely doing nothing with barely air flowing into the big Exit bag like other videos I have seen of people. What am I doing wrong? I need to go. I truly need to go before I get sickefr. What am I doing wrong please tell me. I am not technical but I don't believe I am an idiot either. Please help me! Please!