I seem to have an odd problem. My water is medium hard, gh 11 and kh 8 with perfect ph right out of the tap. However, the ph soon drops to the quality of battery acid and stays there. I cannot bring it up with chemicals. Once I used almost an entire can of PH Up and it did nothing. Not to mention that fluctuating ph is terrible for the fish. I have lost so many fish that I don't even want to think about buying more until I am convinced that the ph is in an acceptable and stable range. The thing is I don't know how to raise it properly. My primary tank is 55 gallons. What will bring the ph up to a level that will be safe for fish and stabilize it? Also, can anyone tell me why the ph drops like that, it is because of the kh? I thought a high gh and kh kept levels stable? Thanks in advance for any ideas.