why in the world would you tell someone to remove the wood, and never put it under the water? submerged wood IS 100% safe for frogs. the white fungus that grows on it after it gets wet is normal. it goes away in a couple weeks. it is a natural occurance when hardwoods get wet and is not harmful to the frogs. in fact, it helps the frogs by breaking down bioscopic waste. everyone has fungus in their tanks if they have any soil whatsoever in them. fungus is natural and normal. it keeps the floor of your enclosure up and running and bolsters the biological filter.