Quote:
Originally Posted by naesco
Would you agree with my comment brad?
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I really want to, but can't

I haven't found any difference in behaviour in any tang going from 4' to 6'. Even the faster acanthurus species, who get a bit squirrelly in the 4' stay that way in a 6'. I agree a 10' might make a difference, but not going from a 90 to a 180.
I think what might make a difference is a newbie starting with a 75g stacked with too much rock. Then moving to a larger tank where they scaped differently and provided a more secure feeling environment.