Ugh...got home Saturday night to find the drop checkers in my tanks a lovely shade of blue.
Upon further inspection, I found an empty CO2 bottle. Since it was still at about 900 psi a week ago, a leak must have sprung in my plumbing somewhere.
Of course it has to happen on a Saturday, so I can't get it filled until Monday. And right after I introduce a big batch of plants. Good luck getting them to root well with no CO2.
Well, in my typical overkill way...I dropped the bottle off at Airgas this morning for refill, and while I was there, I threw the plastic at them and just bought another 20lb bottle. Expensive, but I should never have this happen again.
Now just gotta find the leak tonight. Isn't our hobby fun?