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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.


Meetings are Moving!  Check back soon for details.

CAS Sponsor - Visit all our Sponsors Here!


Next General Meeting:

Confirmed Event
Friday, September 2, 2016    7:30pm
September General Meeting

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

Event Open to Anyone

Notice of meeting of the Colorado Aquarium Society, Friday, September 2, 2016 !

Friday, September 2, 2016 @ 7:30 at the Bethany Lutheran Church, 4500 E. Hampden Ave. This will be our fsecond meeting at the new location, so tell your friends! If you enjoy the aquarium hobby, want to learn more about your fish and you want to have access to new species and new varieties, join us once a month for a very fishy experience.
Non-members, visitors and guests are always welcome. No cost to attend. Family friendly. Get Fishy!

·         Our guest speaker will be Andre Volosov, who has been keeping fish for the past 64 years.  The title of his talk is thus, very appropriately, “Sixty-Four Years of Fish Trouble: Tales from a Very Old Aquarist”.  He will share some of his stories about the aquarium hobby in the Soviet Union, Europe, and the United States, along with some principles about how to keep your fish happy and healthy.  This presentation is highly recommended for beginning aquarists especially, but should certainly be of interest to even the most experienced aquarists.

·         We will have a mini auction of fish, plants and other fish related items.

·         Our Bowl Show categories for August are: 1. Native Fish. Fish native to the U.S., such as Bass, Sunfish, Minnows, Catfish, Killies, the Texas Cichlid, wild Sail-fin Mollies (P. Iatipinna), and Mosquito Pish. Does not include Carp, Brown Trout or other imported fishes. Fish shown must be the native wild types, not hybrids. Shown in pairs, large species may be shown alone. 2. All Other Non-Fish Aquarium Animals. Amphibians (frogs, newts, salamanders), Lizards, Turtles and any other form of aquatic or semi-aquatic life that is not a fish or an invertebrate. See prize winning fish! Win some prizes yourself. Bring your fish to show!

Upcoming Fishy Events: Mark your calendars so you don't miss out!


·         Colorado Aquarium Society Board of Directors meeting, Friday, September 30, 7:30

·         Rocky Mountain Cichlid Association Meeting, Friday, September 9, 7:00

·         Colorado Aquarium Society Monthly meeting, Friday October 7.

·         Colorado Aquarium Society Fall Auction, all day, Saturday, October 29. This is the big one, fish, equipment and friends to meet with.

·         Rocky Mountain Cichlid Association fall auction, Saturday, October 22.

·         Colorado Aquarium Society Monthly meeting, Friday November 4

·         Colorado Killi Club meeting, Sunday, To be announced,

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


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: 9/2/2016

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

  • Native Fish. Shown in pairs, large species may be shown alone.
  • All other non-fish aquarium animals. Amphibians, Lizards, Turtles and any other form of aquatic or semi-aquatic life that is not a fish or an invertebrate.
  • Open Class.

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 #15 - Beginner
Guess That Smell! If your fish tank has a smell to it, it is a very good guess to say that it is ammonia. Ammonia is natural from fish waste and food decay and is proccessed into plant and algae food in this proccess. However, if you can smell the ammonia in your tank, it is probably strong enough to cause your fish to die soon. A fifty to seventy-five percent water change should be done every day until your tank doesn’t smell any more.       - T. Fells
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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 are held the last Friday of each month at a member’s 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 member’s input is recognized and appreciated. It is also a great way to see other member’s 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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