03-08-2013, 11:55 AM
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It must be hard woods, like the beech Quantum mentioned, or oak. These two I know of, but there are obviously other hardwoods. Avoid any soft woods, conifers, etc.
Make sure they are completely dry. Collecting dead wood that has been broken off the tree for quite a while is easier. Break a pice off at the thickest point and ensure it is completely dry throughout. And all bark removed.
I collected branches like this and put them in my plant tank with no fish (the tank I use to QT new fish) for several months, watching for any signs of fungus, growth shoots, critters, etc. Nothing appeared, so they went in the main tank. They were also waterlogged by then so they sank.