Bleach would only kill anything living on it or it could react chemically to some things and convert it to other things. It may not do anything to pesticides or other chemicals.Thank you, Al, for such a well-written, insightful post. I may never use these rocks, but I certainly couldn't resist bringing them home with me once I saw them. And the first thing I did was post on here so that I could read and hear all the differing thoughts on this matter.
Even if they were sprayed with pesticides, wouldn't soaking them in barrels of bleach water and then sitting them in the sun for days dissipate all of that? I almost feel like I owe it to everyone to do something with some of this rock just to see what the ending to this story is!
Hey, any excuse to start another tank, right?
Sue