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I have an alkalinity test but it doesn't say dHk on it. Is it the same thing? But is this going to explain the brown problem that I have on my sbstrate?

I am having the same problem and i have not used a buffering agent. Although I do not have a cal test kit (should I have one ) and I am not sure what dHk is could some one help me out.

I have had the same problem! I have had my tank since Jan 2006 it is a 46 gallon Bow Front. I bought a cleaner crew. and it seem like it is not helping the problem. I have some live rock in my tank but not the recommened 1 to 2 lbs per gallon of water. I have done a 20% water change and my...