04-09-2012, 05:41 PM
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I've only recently started to add driftwood to my tanks and only use malaysian driftwood. Many use mopani but there is a slight chance it may grow a toxic fungus at some point down the road, grapewood is also offered for sale at some stores however I have read several horror stories of mould and fungus growing on this wood so I would recommend you avoid it.
Driftwood is added for numerous reasons. Many plecos require a certain amount of wood in thier diet, it adds a natural look to the tank, certain plants such as anubias and java fern need to be anchored and cannot be planted in the gravel so driftwood is used as the plant roots will actually dig into the wood, also the wood will release tannins which will make the water a yellowish tea color, again this can make for a more natural look also the tannins will lower the PH of the tank. If the yellowish color and/or the lower PH is undersireable you can boil or soak the wood to remove the tannins before placing it in your tank.