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Old 02-18-2013, 07:55 PM   #2
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Lava rock should be fine. It's inert, and won't affect water chemistry (unless it's got other stones mixed in, or some sort of contamination, but I think that's somewhat rare).

My first paludarium build was just a bunch of lava rock siliconed together to create a background, waterfall, and ledge.

It was incredibly time consuming and heavy, but worked pretty well, didn't look bad, and moss loved growing on it.
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