So here are some sources for artificial / faux coral decor, available in many different colors, shapes and sizes.
Another option is to purchase coral decor from aqua culture farms. Look for outlets in your area that exclusively sell corals from culture farms. And ask the sales person about the source of their corals to make sure you are not buying those which are harvested from the sea.
Coral reefs cover a very small part of the ocean, less than 1 percent. But they contribute hugely to the sustenance of ecosystems needed in the oceans, attracting and supporting diverse sea life. Protecting coral reefs is a critical environmental issue. For more information read the article at Beach House Living.