i have a Q... can i still use te bogwood that has been at my moms house ( she died which im still depressed and sad bout ) can i use tha bogwood its been outside on top of a gastank that heats teh house and no piss or anthing that i can tell is in it. so is that alright?? i ahve another that was at the side of my moms house to but dunno bout that one.. and can i use river,stream,lake rocks???