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Reefs.org

– Articles, discussion boards, and surveys about saltwater reef aquariums.

Frag Outpost

– Free website for buying, selling, and trading coral fragments between reef aquarium hobbyists.

UltimateReef.com

– Includes discussion boards, live chat, articles, and images relating to the marine reef aquarium hobby.

3reef Forums

– A resource for reef aquariums with forums and product reviews.

The Reef Tank

– Information on starting and maintaining saltwater and reef aquariums. Message board, chat room, product reviews and links.

Michigan Reefers

– Dedicated to reefing questions and answers along with live chats.

MarineDepot.com Forums

– Features discussion forums moderated by recognized experts and scientists in the field. Topics include corals, disease, invertebrates, fish and husbandry. Also includes general purpose discussion forums on the aquarium hobby.