Beverly, sorry about your luck. I've been thinking about your first post when you said,
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Had a build up of cyano on the back of my 120g for some time now,
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I think you are correct that the black matter was dead cyano, and that cyano had taken over the bio loading in your tank. I'm glad that your tank is recovering now. I believe that we can all learn from this experience; to not let cyano fester in our tanks.