My tank pressure gauge on my milwaukee regulator is reading about 525psi. I have a 5lb cylinder and this was my first fill and use of pressurized so i didnt know if this means refill soon. when it first was filled it read about 750psi. That was about a month ago. I run about 3 bps on my 20g. Is it normal to empty this fast? Let me clue you in on an embarrassing thing that happened when setting up. I didnt know what i was doing at first and turned on the regulator at about 100 psi working pressure for a few seconds before i realized the immense bubbles in the tank that made my water look like it was boiling. Good thing fish were fine but i'm guessing alot of co2 was wasted during that experience. Anyway, let me know since this was my first fill and use of pressurized.