04-03-2011, 02:27 PM
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I would keep a very close eye on the fish. I know of fish deaths due to wood fungus.
The white fungus that appears on new Mopani wood (the two-tone wood) can harm fish. I had this occur in a 90g tank; a few days after adding a piece of this wood it developed the white growth (which is a fungus from the wood itself), the water got a bit cloudy, and I noticed the corys respirating much faster. I pulled the wood out, did a major water change (3/4 of the tank) and things returned to normal. I scrubbed the wood under very hot water with a brush and put it in a tank with no fish for several weeks. I had one small bit of this fungus, scraped that off, then no more. It is now in another tank and has been for a few months with no issues.
Co-incidentally, I happened to be in a local fish store and overheard another aquarist asking if this could have killed his corys, so I joined the conversation. He also had Mopani wood, saw the white fungus, left it, and several corys were dead within a couple days.
I've only heard of this occurring with Mopani wood.