Lots of things worse than collecting is killing the reefs.. Clumsy divers themselves cause more damage than our hobby does to the reefs. As a divemaster you are always warning somebody away from kicking the reef or touching things that shouldn't be touched. But we should be aware that the coral did come from somewhere. Same with most of the fish. You don't keep giraffes in your backyard because you know you don't have the facility to keep them, or should know this... Same with some reef creatures. There are some things that are as common as sparrows and should pose little concern, but that big head of brain coral you bought may have been pried off a pretty reef somewhere. At least when buying cultured frags, the damage to the natural ecosystem is reduced. Anything that is grown in a big tank, like many of the available clown fish, or cultured frags on a piece of substrate should not make you feel guilty in the least. I think the point is to take responsibility for what you buy from the LFS, because your shopping habits control what gets collected and how. And use your reef to instruct others in the beauty we may be losing if we don't get serious about the environment. Point out how careful all the parameters must be for these creatures to multiply and how difficult it is to maintain that balance.