When I was new with Milwaukee, I had beginning of the tank dump, not end of it. Before I left for a 10 day vacation, I replaced the CO2 cylinder as it was about running out of gas. I was careless and didn’t spend enough time to observe and assure the CO2 despensing rate is stabilized. I returned home and noticed a stench of dead fish as all 10 lb of CO2 was dumped in less than 10 days. The fish had decayed for so long that the water had turned into stenchy fish soup. I didn’t lose any plants though as they were over fed with CO2 except for exceccive algae due to death of all algae eaters.
Adjusting Milwaukee bps is tricky requiring dual adjustment of the 2nd valve and needle valve due to its inability to handle high back pressure.. Therefore, Milwaukee recommends the use of low pressure reactor and against using high pressure ceramic diffuser. Milwaukee instructs using the 2nd valve as the primary adjustment. Big mistake. I followed Milwaukee instructions literally, leaving the needle valve wide open that led to dumping the entire tank of CO2 due to pressure destabilization. The safe way should be the opposite, using the needle valve as the primary control gate keeper against dumping.
Milwaukee is only cheap, but poorly designed and made. My other regulator is Ista I bought from Big Al, which is much easier to control and can handle high back pressure.. It requires adjustment of only the needle valve, as the pressure of the 2nd valve is prefixed in the factory.