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I found this black stuff growing on one of my frag plugs. What is this? How bad is it? And how do I get rid of it before it spreads?

A few years ago I had a Fluval Edge fish tank and I also had some spare parts, i.e. filters and bulbs for it that I purchase at my LFS (for the over priced retail). Last spring I sold the tank and recently ran across my box of extras. So I sold them on FeeBay for a fraction of what I paid...