I just set up a new kegerator with a corny and 5 lb CO2 tank. I turned the tank on and at first I had a leak I could hear/feel, but I tightened everything and sprayed with starsan and don't see any bubbles now.
However, every few hours since I started carbonating (it's been about 10 hours) the pressure on the keg decreases from 15 psi where I started down to 10 psi. The pressure on the CO2 tank started at 50 psi and is down to 45 or so. I haven't been able to find info on whether this is normal. The beer and CO2 may have decreased in temperature since I started, because it had only been in the fridge a few hours when I started carbonating.
Is this normal, i.e. the CO2 is absorbing, or is it possible that I have a leak?