I just pour boiling water over the rocks in my sink and scrub the crap out of them
Originally Posted by okiemavis
Then do the vinegar test- pour some vinegar over the rock, if it fizzes, it's not safe, and don't use it.
Um.. I thought that if it doesn't pass the vinegar test it would just raise the pH? I swear I remember reading up about that. Lol I hope thats not right, because my littler sister bought me a rock from my lfs and it didn't pass the vinegar test but I didn't want to make her sad so I put it in anyways? The fish are fine and it hasn't done anything to my pH as far as I can tell.
I pretty much knew it wouldn't pass though, its a really porous rock.