Mine never really have moved around much. As they've grown they've shifted around a little, or picked a neighbouring rock that was larger, and so on. I think I've also noticed them move a little if I go a little too long between feedings. But rarely more than 6". Nowadays I just feed a tiny bit of mysis every day or two and that seems to keep them placated. I think if you can get them in a spot where they're happy (flow-wise and lighting-wise), they tend to stay put.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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