Lava Rocks

Yes.
 
wash the rock off. observe anyhting funny from the rock and then place in tank. iu have bought many pieces of lava rock over the years and done that procedure. no worries; no problems.
 
well i boiled a bit pot of hot water and poured it in my sink with my 4 lava rocks to saod after i washed it off for a good ten minutes and let it soak in boiling hot water and now everything is fine..no problems the rocks been in my tank about a week now..
 
what ever you do, don't buy lava rock at the pet store. Go to a rock place and get all the lava rock you could want for under 10 bucks!
 
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