03-01-2013, 11:02 AM
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Originally Posted by Oxon Fish
In the cold light of day the water does have a brown tint to it and the filter is quite brown, i take it this is from the wood.
Not sure if it is worth putting it back in or changing to some rocks.
The brown tint is most likely tannins from the wood. Mopani I have found to have a lot of tannins. These are not harmful.
That is a nice chunk of wood, it is worth trying it. The fungus may be non-toxic, unfortunately there is no way to test this except in a tank with fish.