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Can I put lava rock in my tank? I have a few pieces I picked up during my holiday and I think they will look cool with plants attached to them. Would they change the pH of the water? How do I make sure they are safe?
i just rinsed the stuff i got from my lfs and it never changed or affected my water in any way but i agree with tiffi that you should boil yours because there may be hidden stuff. i personally love lava rock because it is the fresh water version of live rock. it is really good to have in an established tank because throw a chunk of that stuff in a uncycled tank and it speeds the process up big time.
I have lava rocks loaded in the 55 and 150 gal tanks and it has not affected anything regarding water parameters. Before putting it in the tank I just rinsed it off to get the loose pieces of rock and rock dust off of it.