06-07-2011, 11:01 AM
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Agree. Wood that is soft and falling apart when it is lightly touched is past its prime and as it "rots" it may cause trouble.
One caution on mopani wood, it is known to carry various fungi, some of which are very toxic. I've had personal experience with this, and know others who lost fish.
I have never (yet) had problems with the very dark, almost black heavy wood. I have seen it called ironwood, jeti wood, mangrove root, malaysian driftwood. It is heavy, sinks immediately (no waterlogging at all), is light on tannins after the initial bit, and remains hard for years. You can see it in my aquarium photos. I won't buy any other now.