For live rock you can also look for suppliers who provide "aquacultured"
rock. Basically that's rock they have placed in the water and harvest as
it matures so they're not damaging any natural reefs. Tampa Bay Sal****er
(www.tampabaysal****er.com) is an example of a company that sells
aquacultured rock. You can check out their website for more info.

Joel wrote:

I just posted a reef question earlier, but I forgot my most important
question. My biggest concern is the environmental impact of this hobby. I
have seen websites for companies that have tank-raised specimens, and that
sounds good to me. I just could not stand contributing to over-harvesting
just for the sake of having a fish tank. What do environmentally conscious
hobbyists do?