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What you bought was probably uncured bog wood. What you now have in the water is the natural color of the wood leeched out into your water.
It shouldn't hurt your fish, but it doesn't look good unless your going for the bog-look. You can do two things, one, change your water and in a few months it will go away, or remove the wood and soak it in a container of water until it stops coloring the water. I've had success boiling the wood for an hour to get the initial coloration out.
It is a very common problem with bog wood, sometimes it will also acidify your water so you will want to keep a weekly eye on your Ph and make sure it isn't effecting your water.
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