A truly impressive saltwater reef that mimics the environment of oceanic fish needs a coral reef that acts as a natural habitat and visual centerpiece. Live coral reefs are living, breathing organisms that require precise care and maintenance to thrive. eBay vendors sell supplements and starter kits for a live setup. Artificial coral reefs are decorative ornaments, not living organisms, and are easy for beginners to manage in even a very large tank. Vendors sell coral reef products in new or used condition.Shop the large inventory of pet supplies and other aquarium live rocks!