I have a couple of pieces of mopani wood, which I have steeped in hot water and boiled as much as I could but I still have this horrible pale slimy stuff growing on them. 
Will it go away by itself? Is it safe? I don't really want to take the wood out as I have live plants around it.
Will it go away by itself? Is it safe? I don't really want to take the wood out as I have live plants around it.
