if you only have fish in your tank, no snails, shrimp or plants, EM tablets have worked for me in the past..and they're a little cheaper than chemi-clean..and chances are if you know any guys that have been in freshwater for many many years, they probably have some lying around collecting dust...it's simply erythromyacin antibiotics.
naturally, don't forget to take out any carbon, and after about 3 days, you'll want to do a large (50%) waterchange, syphoning your gravel at the same time.
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