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Lava rock = Gas grill rock?

2948 Views 6 Replies 5 Participants Last post by  hatterbee
Can you use bags of "lava" rock that is sold at the hardware store for gas grills? This rock is small enough for a background and cheap, but I'm not sure it is the same thing you buy at the petstore. Any help?

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Makes a good biological media for wet/dry filters too.
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