Text this: Pengaruh Biofilter Rumput Laut Gracilaria sp. terhadap Dominansi Plankton pada Media Air yang Terpapar Logam Berat Cr <br><i>[Effect Of Biofilter Of Seaweed Gracilaria sp. To Plankton Domination On Water Medium That Exposed To Heavy Metal Chromium (Cr) ]<i>