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if he has any ceramic rings, bio balls, anything like that, you'll get alot more bacteria per square inch of material... if not, just a sponge, or something from the filter will work... the brown stuff is more gunk than bacteria, though there will be some in it... better off to get something with the bacteria on it
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-Jonathan
"What, exactly, is the internet? Basically it is a global network exchanging digitized data in such a way that any computer, anywhere, that is equipped with a device called a 'modem', can make a noise like a duck choking on a kazoo." - Dave Barry
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