I have a 10 lb and 20 lb CO2 tanks with regulator and solenoid. I believe the 20 lb cylinder is pretty full but the 10 lb is probably empty. I took the tanks back to Watts Welding, where I paid the deposit (i.e. core charge of $120 ea.), and learned that they sold out a few years ago to Airgas...

Hey all, I have a Reef Fanatic CO2 regulator which is a year old. This is the type which does not have an adjustment but is automatically set to deliver CO2 at a set rate to the needle valve (think no separate regualtor knob to adjust back pressure). Until recently, I had no difficulties. A...