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Old 09-02-2013, 06:03 PM   #1 
JelloBetta's Avatar
Join Date: Aug 2013
Location: British Columbia, Canada
Goldfish and Bettas?

Hi everyone!

I just got my "comet" goldfish today and was wondering if I could out them in the same tank. They are seperated in different tanks, Chip hasn't flared yet.

Chip is currently in a 3 gallon tank, while Clover, the new goldfish, is in a 2 gallon. It should be a large enough tank for both.
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Old 09-02-2013, 06:15 PM   #2 
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Join Date: Aug 2013
Location: San Diego, CA
No no no no no. Goldfish need powerful filtration devices that would blow bettas all around. They're also coldwater fish and need the temperature around 60-70 degrees. Too cold for bettas. Also it's possible the betta could nip the goldfish's tail. On the other hand, goldfish can get huge -- huge enough to eat your betta.
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Old 09-02-2013, 06:37 PM   #3 
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Join Date: Dec 2012
Location: Alberta, Canada
First off, goldfish need really large tanks. Fancy goldfish need at least 20g plus 10 for every additional goldfish, and comets need even larger tanks. They are messy fish and need lots of filtration.

+1 to Torla. Lots of factors make goldfish and bettas incompatible.
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Old 09-02-2013, 06:39 PM   #4 
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Join Date: Oct 2010
Location: Victoria, Australia
I have three shubunkin that are the size of my hand in a 45 gallon tank and their growth has been stunted from that even though I do regular water changes.

A comet goldfish grows to at least a foot in size and has a life expectancy greater than most dog breeds.

If those are the biggest tanks you can provide than I think you need to look at returning it or finding someone with a pond who would be happy to take your comet.
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Old 09-02-2013, 06:42 PM   #5 
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Join Date: Mar 2013
Location: Oklahoma
In fact, a comet goldfish should be in 55 gallons or more. They are more suited for ponds than aquariums! Despite their coldwater preference and high waste output, keeping them in a small tank will stunt their growth, to the point where they will eventually die from their insides growing too big for their bodies.
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Old 09-09-2013, 02:45 AM   #6 
Join Date: Apr 2013
Like everyone else said, a betta and goldfish should not be housed together, because their requirements are just too different. Even if the two fish seemed compatible behaviorally speaking, the differences regarding betta and goldfish needs as far as temperature, diet, filtration, tank size, waste output, and more means putting bettas and goldfish together, especially a comet goldfish which can grow to over 1 foot is not recommended. However, while goldfish are a no go, there is a variety of compatible fish bettas can be housed with, but you will need a larger tank, as three gallons is fine for a betta, but not for betta+buddies. This site has a nice compatibility chart.

Also, a two gallon is not nearly big enough for a goldfish, especially a comet goldfish. While it might be fine for a very, very brief time IF your fish is tiny, you are keeping the water spotlessly clean with a good filter ,making sure there is no food waste etc, and are going to move it to a much much bigger filtered aquarium or pond preferably with other goldfish ASAP. The two gallon aquarium is not a suitable permanent home for any kind of goldfish, let alone a comet goldfish which A.) naturally can grow to over 1 whole foot in length B.) is one of the most active goldfish types, and therefore would do better with more room to move around, and C.) comets, like the common goldfish which they were bred from are social fish who do best with their own kind for company and can display symptoms of severe boredom without other fish, or at least items to interact with.
Since the comet cannot stay in the 2 gallon permanently, I suggest you either get a much bigger aquarium (or build a pond) for your goldfish or find somebody with a pond or huge aquarium who will be wiling to take it. You could also see if the pet store will be willing to take it back. If you like the pond idea and are in the northern hemisphere where it is getting to autumn, and if you are in a place where ponds freeze over, you should try to find someone with a pond quickly before they have to close up the pond and stop feeding their pond fish. Good luck!
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Old 09-09-2013, 06:11 AM   #7 
Join Date: Jul 2013
Location: Sarasota Fl
THey go from this to this in a matter months

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