What do you mean that you added enough ammonia to reach 4.0 ppm
? If there is nothing to break it down, it's going to stay at 4.0.... Do you have any other tanks at your house? Or does somebody you know have any tanks? Your neighbor? If so, get of their gravel or one of their filter cartridges or something from their tank, and put it in yours.
Once you get some nitrifying bacteria in their, and they start reproducing and all, you should see your ammonia levels drop. Then you nitrite levels will rise, and soon, after all of that, you will see some nitrates.
I advise that you read the AA article of the Nitrogen Cycle, to get a full understanding of how the process works.
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