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Amazon.com : VILLCASE Large Aquarium Rocks Aquariums Volcanic Rocks,Natural Underwater Lava Rock Ornament Lava Filter Material for Fish Tank 450g Lava Rocks : Pet Supplies
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LAVA ROCKS as MECHANICAL filter ? people use lava rock as bio media in small-sized pebbles but i want to use it as mechanical filter in in my diy filter for my
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