This is very complicated matter, and one that is close to my heart. The industry just does not care, greedy humans. 98% of the fish collected for the trade die within the 1st year, most never make it to home aquarium. There will never be enough large tanks to house the number of large fish that are collected, most will die. Because of this I support people with good intentions of getting larger tanks or have resources to rehome the fish when it gets too large. This is also why I resent the self righteous hypocrites that serve as the "tang police". Maybe keeping a juvi blue tang in a 75 while planning a larger tank gives that fish a chance for a good life; otherwise there' a 98% chance he will be dead in less than a year.