What is the best way to anchor a piece of driftwood in the tank? It is from Lake Superior and has been soaked in clean water (in a kiddy pool!) for several days and powerwashed and is ready to go in the tank. My tank is 240g and the piece is about 4feet long and 2 feet high (cut from the gnarled roots of a washed up tree trunk!) We were thinking of using paving stones as anchors and covering them with substrate, but how to actually attach them to the wood? Better ideas? Please let me know! Anything else I should do to this wood before it goes in? I can't boil it as I do not have a pot big enough 
