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I put 4 in a 210 gallon and they all went to the same hole (hiding place). You could see them stacked like firewood. A week or so later there were three. Another week or so and there were two. Four years later, one often didn't come out but sometimes did. And that one then disappeared. Another six months and the last one disappeared. I attribute the first two deaths as rivalry. The last two, I think was lifespan, but I'm not sure. After the last one disappeared, I figured he was dead, but a few weeks later I saw him in a new hiding place, but I haven't seen him since.
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