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#3
06-10-2009, 03:43 AM
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I don't usually have those now (though occassionally there are trace amounts). I am, however, running a sump and a Fluval cannister filter, and I change water every week. It seems to me there are lots of factors that contribute to NH3 and NO2 levels.
So I guess my question is, will all rocks completely change? How heavy does the growth get? 
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