Taken from another thread on a different site:
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When introducing new fish I have successfully used mirrors. The resident fish seem to dislike reflections of themselves even more than a new fish.
Many years ago I added a Copperband using this method. He was completely ignored by the locals who were dealing with a much more serious invasion. After a few hours like this, even the new Copperband was out in front of the mirror threatening itself and still being ignored by the others. Unfortunately the mirrors didn't protect it from the poorly designed overflow I had at the time.
I like the idea of a transparent container tho, and may use it, and the mirrors, when I introduce the new Copperband I got last weekend."
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While reading it I thought of this thread, perhaps this way would work?
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