So I went out of town for 3 days and upon my return I find that my dual chamber MRC calcium reactor is bone dry, no water in the bubble counter, and my co2 tank, which was 75% full, is now empty. What could've happened? I Did an immediate 30% h2o change to bring my "off the charts" alk and calc levels down. Plan on another 30% h2o change today. Corals are ok but not happy at all. Fish We're very reluctant to eat but are getting their energy back. Any ideas or suggestions?