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I'm having a problem with my Co2 causing my pH to drop. The tank lights and co2 are on from 9:00 AM to 5:00 PM. this morning I tested the pH before the lights and Co2 came on and it was between 7.2 and 7.6. But I just tested again at 3:30 PM and my pH tested at 6.4! My tank is still cycling...