Did not notice my CO2 going low in my calcium reactor and the next thing I know all my Acros bleached. pH did drop to 7.9-8.0 and alkalinity to 2-2.5 meq/l. All other prameters were within normal range. Any thoughts? I know I need a new pH probe because it probably would have turned off the reactor since my pH on my regulator still reads 8.5. It is a shame because for the first time since I reentered the hobby I was about to start fragging my corals and giving them away.