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The Colorado Aquarium Society, established in 1947,  is an open group for aquarists to share their interest in all facets of the aquarium hobby. Our members consist of advanced expert hobbyists as well as beginners and all levels between.  If you are interested in learning about the hobby, sharing your experience in the hobby, or would like to discuss any aspect of fish, invertebrates, plants, aquariums, ponds, and amphibians, The Colorado Aquarium Society General Meetings are open to the public and everyone is welcome!

The CAS was established in 1947 and incorporated under Colorado law as a non profit organization on November 6, 1962.

For a detailed review of our history go to our history page.


Saturday, April 1, 2017 - CAS Spring Auction!
4500 E Hampden Ave, Cherry Hills Village, CO 80113

New and Used Equipment!
Freshwater and Saltwater Fish!
Dry goods, fish foods, and chemicals!
Plants... and much, MUCH More!

Our Spring Auction is an all day event so stop by anytime!
Snacks, Pizza, and Drinks Available!

Sellers Come at 8:00am
Viewing Begins at 9:00am
Auction Starts at 10:00am

Everyone is invited!  Bring a Friend!

CAS Sponsor - Visit all our Sponsors Here!


Next General Meeting:

Tenative Event
Friday, April 7, 2017    7:30pm
April General Meeting

Bethany Lutheran Church
4500 E. Hampden Ave
Cherry Hills Village, CO 80113

Event Open to Anyone

Program: TBA

Become a Colorado Aquarium Society member for only $16 per year for the whole family. Visit us and see what you have been missing.   


Promptness Award: Make sure that you are at the general meeting by 7:30 for your chance to win the Promptness Award.

Bowl Show

Competition Date: 4/7/2017

Each Bowl Show has two pre-determined classes and one open class.

Remember:  Only Flat Sided Containers will be accepted.

For More Information on Bowl Show Rules, Click Here

  • TBA
  • TBA
  • Open Class.

Nano Aquascaping Contest

Competition Date: 4/7/2017

Any tank that is smaller than 10g can be shown. No livestock is included. There will be prizes for first second and third place.

    Kelly Dawson Education Fund

    Learn more here.

    Sponsor a tank for a school!

    It takes $50 for tank with fish to be maintained for a school year, however, any donation amount is appreciated.
    Your Name (Optional):
    Donation Amount:

    Random Tip #16 - Plants
    Aquarium plants are a more complex form of life than algae and will out-compete algae if conditions are good for the plants. However, most lights that come with a fish-tank setup are much too weak for aquatic plants to grow well. For more information click here.       - T. Fells
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    Suggestions & Comments:
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    (Optional... please enter if you would like a response.)

    Human Verification Code:
      woztqi    (Code is case sensitive.)

    GENERAL MEETINGS: Everyone is Welcome!

    First Friday of Each Month at 7:30pm

    Bethany Lugheran Church
    4500 E. Hampden Ave
    Cherry Hills Village, CO 80113

    Get Google Map
    General Meetings are held on the first Friday of every month, and feature a cash promptness award, a detailed program on a specific aspect of the aquarium hobby, a bowl show, a mini-auction, and announcements of up-coming activities.

    General meetings are open to the public. We welcome guests, so please feel free to attend if you are interested in aquariums and ornamental fishkeeping.

    For more details on this month's meeting, see our Meetings And Events List


    The CAS encourages its members to breed and show their fish through various programs such as Bowl Shows, Grow Competitions, Aquarist of the Year, and more.  Members who place in these competitions are awarded points that are accumulated towards a number of different awards.

    Learn more about CAS Competitions, Bowl Shows, and Grow Contests.


    Mini-Auctions are held at the end of each General Meeting and include fish, plants, supplies, and equipment. Please note that there is a 5 item per member limit on items to be auctioned at the Mini-Auction.

    Mini Auction Information:

    If you did not get your labels at the meeting, and would like to pre-print labels, you can print these.
    Printable Labels - Normal Items
    Printable Labels - Minimum Bid Items
    If you would like to print these labels, you must attach them with packing tape that covers the label completely to protect it from getting wet. Also for Minimum Bid, if your printer doesn't print the pink for minimum bid, you will need to highlight in Pink / Red after printing.

    For more information on Auctions, visit our Auction Information Page.

    BOARD MEETINGS: Members Only

    Board Meetings are held the last Friday of each month at a memberís residence.  They are the business meetings of the CAS and are open only to members.

    Members are invited and encouraged to attend. Non-board members do not have voting rights but memberís input is recognized and appreciated. It is also a great way to see other memberís aquarium setups.


    Throughout the year CAS hosts a variety of educational and fun activities for its members.  Annual events may include a fish show, auctions, a Summer picnic, and the Christmas Party / Annual Awards Banquet.

    In addition, other special events are held and vary each year.  Past years events have included: field trips, collecting trips, workshops, making fish food, and home (fish room) tours.

    View Coming Events List


    CAS holds two auctions annually: a Spring Auction and a Fall Auction. The purpose of these auctions is to generate operating revenue. Auctions are open to the public and we invite everyone to attend. Items include: bagged fish, hardware such as tanks, heaters, filters, etc., and supplies such as food and water conditioner.
    For more information on Auctions, visit our Auction Information Page.

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