I bought those three pieces of mine. I had a large piece I collected that I was going to use. The problem with that was A. I didn't know what type of wood it was since the bark was gone. Not all wood is safe for tanks. B. After I got it boiled and scrubbed I found a soft spot and ended up digging a bunch of wood out that was already breaking down so I knew it would be a disaster in the tank. I ended up buying some.