Mine never moved from it's spot, in a 15g nano, for almost 2 yrs. Then, about 3 weeks ago (just about the time I wanted to move it to a 55g) it split for the first time, and both "halves" cruised around a 10lb rock for about a week. The poor things are now adjusting to life in a 55g, and still continue to cruise around the same rock.....
~Tamara
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