Welcome to CMAS

The Chicago Marine Aquarium Society (CMAS) is dedicated to providing the reefkeeping hobbyists with the richest community from which to share ideas and learnings and monthly meetings and twice yearly frag swaps to get you the goods.

CMAS Frag Swap - April 27th 2019
Come to our frag swap for frags, vendor & member booths April 27th at 9:30am at the Odeum Expo Center in Villa Park.

Click here for more details

New! CMAS Members Forums
Join the discussion at our new CMAS Members Forums.
Subscribe to our newsletter
Stay up to date on our latest announcements and events.

CMAS is proud to be a member of the Marine Aquarium Society of North America.