07-20-2012, 05:55 PM
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The Malaysian Driftwood is dark brown, almost reddish-brown, sometimes near black, and heavy. It sinks immediately. Tannins are not too bad; I just soak new pieces for a couple days in a pail. This wood is more chunky, it is excellent as fallen logs, tree stumps (placed vertically, some pieces are perfect), and it has a lot of tunnels which is super for catfish and loaches who have a riot in this. You can see it (sort of) in the photos of my tanks under "Aquariums" below my name on the left. I have a lot of it.
The Mopani I have never liked, but it does come in branch-like pieces which is useful. I get it mixed up with grapewood and Manzanita wood. Not sure if these are all different or not, stores often mis-label stuff. Some of this wood will carry fungus.
Now, there are many, perhaps hundreds, of species of fungus. Some is highly toxic, some is safe. Without knowing the species (and this means an examination by a microbiologist) it is impossible to say. But I have killed fish with a fungus that appeared on a piece of this wood, and I know others too. I will never again take the risk.