imho not anyrock will do if your picking them up from the outdoors. rocks that are very porus will have hundreds if not thousands of little tiny tank killing buggers in them. rocks that are to shiny or have portions that are shiny may contain to many metals. i suggest bakeing them in the oven to kill whatevers lurking on it then soaking it in saltwater / vininger for a couple days before puttin it in the tank.As for wood you need to also clean it very well and yes depending on the heat and mosture it will rot, but that adds a certian " naturalistic" look to the tank and wont happen over the course of the week. I should also add i am in no way an expert in any one of these fields when it comes to careing for a Viv so if anyone has conflicting advise i hope thay post it here so we both can learn something
