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On the environmental impact of aquarium keeping:
I think the key is to build as many reef aquariums as possible, but to build them as non-intrusively as possible. Buying cultured rock and coral is of course a great way to do this. Some corals can also safely be harvested in a controlled manner from the reef. It's the responsibility of the hobbyist to learn these distinctions and minimize the effect of their hobby.
But increasing the number of aquariums is important (both large show aquariums and home aquariums). People are only interested in preserving what they know and familiarizing people to reefs is an important step in saving the reefs.
The reefs are delicate, and it is (unfortunately) conceivable that many reef species could one day exist primarily in captivity. The more experince and understanding we have with reef husbandry the more likely we'll be able to keep these amazing things alive.
I have the luck of living close to Inland Aquatics one of the larger culture sites and it's great to go wonder through their tanks, seeing how corals have grown, and saying hi to fish I've known for 5+ years.
A lot of interesting corals do well in captivity with the right settings. A lot of trading goes on between hobbyists which helps everyone.
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