I think if people are going to keep saltwater tanks than you are going to have to collect from the wild because there aren't a lot of fish/inverts that spawn easily in captivity. It needs to be done with caution though and that is where the problem comes in. Lets say you see no reason not to take one or two small tangs from the water (or any other herbivorous fish for that matter), if everyone had this mentality than algae would start to take over and cover any corals that might be near by. And I'm not overstating that, it is happening in many reefs right now, although the local people catching the fish aren't putting them in aquariums they are putting them in their tummies. (fishing down the food chain is a topic for another thread on another forum, not reef discussion). I don't see much wrong with taking a few zoos or ricordea from a pear every now and then, but we must make sure we abide by laws and don't just start hauling off rocks of the stuff. The real problem comes in where catching wild fish/corals is a way of life for certain people in very poor countries. That is why some of them use cyanide or dynomite, its effective, no one is really stoping them, and it might be the only way that family gets any money so they can eat. Also, it becomes a problem of property. If we were sending fleets of boats out to the red sea to cherry pick some corals so we could sell them to people with reef tanks, than problems would come arise like whose property is the reef, and should it belong to the country it is closest too (hence why international fleets of ships aren't allowed to fish within a certain distance of American waters). What it comes down to is we need to make sure we aren't taking more than we really need. Although reef keeping isn't a great money making business (why there are no funds to do research regarding things that would benefit people with saltwater aquariums), we need to invest time into figuring out ways to farm these fish and inverts like we do with most freshwater fish. Coral propogation is taking off, and I think invert and fish farming should have a focus too. No matter how little we think we are effecting the populations.