hear is what happened. The diffuser was a glass one that came with the regulator but I see it sold for 15$. It was clogged, I guess. So once the presure built up I wasn't getting more than 1 bubble per minute, so I turned up the pressure so I was getting about 1bubble every 3 seconds. Not knowing that the diffuser was clogged so when it blew there was co2 pouring into the tank at probably 100bps. This is how so much ended up in the water.
As far as the reading on the gauge goes I don't seem to understand it. When the valve is opened the gauges go up and regardless of what I do with the adjustments they seem to stay the same. so I use the bubble counter to judge the pressure.
I just got a new one for this tank today. An ADA one.
The death was caused by the rapid ph drop. My kh was only about 30ppm.