The Planted Tank Forum - View Single Post - seachem matrix bio best ?
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Old 02-02-2013, 12:01 AM   #45
youdontknowme
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[QUOTE=lipadj46;2420242]Matrix is a man made expanded media and not pumice.

Its natural stone not man made. http://www.seachem.com/support/forum...ead.php?t=3879
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