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As far as I am aware lava rock is inert and completely safe for tanks. I'll leave it for others to chime in as well.
 

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The lava rock I get, from landscape stores, is indeed inert, does not alter any of the aquarium tests I have. It sure needed rinsing though! The dustiest material I have dealt with!
I use the pea sized material in refugium/planted sump/whatever. I grow house plants in it, and pump the aquarium water through it.
 
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