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  1. H

    Help! Charcoal in water!

    I am working at a lab at Penn State where we have a large tank to keep cold water corals. This morning when I came in to feed them the water was black with charcoal dust, almost no visibility at all. Details: About 500 gallon tank/sump A pump (IWAKI Magnet Pump MD-55RLT) pumps water from...
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