Actually, part of the reason several species of tropical fish are going extinct is BECAUSE of aquarium people. There is a huge market for rare, saltwater fish and some collectors go as far as blowing up small portions of the reef to expose the fish. Sometimes they even use chemicals such as CYANIDE to "stun" the fish so that they will float up to the surface for easy retrieval.
Also Tynan, I watched that string theory thing, too. It was by far one of the coolest things I've ever seen on TV. Too bad I only saw the last part of it... I hope it comes on again soon so I can get the whole story!