gasman
What is the air speed of a swallow?
OK just got 2 mats today. Anyone ever use these?They are quite thick and heavy duty. Wondering still should use some bio balls. Setting up a 60 gallon rubbermade container as bio filter.
They're wrong. There is a fundamental difference between the two types and they serve different purposes.Some sites say that this mat acts as biofiltration also.
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