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Old 08-31-2005, 09:25 PM   #1
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Sump Rock

I have bioballs in my sump that I would like to get rid of and replace with another mechanism of biological filtration. Some have recommended that I fill the sump up with rubble rock but I was wondering if there are cheaper alternatives. Maybe lava rock?


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Old 08-31-2005, 09:41 PM   #2
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Hirocks.com rubble is not expensive. I use base rock rubble for everything below water and have bioballs on top of that above the water line.
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Brenden is offline   Reply With Quote

rock, sump

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