How Many Cardinal Tetras In 15 Gallon Tank?

andy305mia

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Hello, I was planning on 10 CT. Nothing else will be in the tank, I have plenty of filtration, just looking for a good number. I don't like to add fish later, because they can introduce disease. So I was thinking more is better, and if I do have any deaths, I can still have a good amount of fish. Thoughts? Thanks
 

Redshark1

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15 gallons seems on the small side for swimming room but 10 CT sounds very reasonable. I might have tried 15 personally.

Look out for whitespot, finrot and Columnaris on the newly purchased fish which will be stressed due to the move to a new environment and possibly different water conditions.

If the filters are used to dealing with this kind of fish population already that would be a big help. Filters that have yet to mature cause significant stress on the fish as they cannot deal with all the ammonia released by the fish.
 

andy305mia

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15 gallons seems on the small side for swimming room but 10 CT sounds very reasonable. I might have tried 15 personally.

Look out for whitespot, finrot and Columnaris on the newly purchased fish which will be stressed due to the move to a new environment and possibly different water conditions.

If the filters are used to dealing with this kind of fish population already that would be a big help. Filters that have yet to mature cause significant stress on the fish as they cannot deal with all the ammonia released by the fish.
I have had both filters up and running for about 3 moths now. Not sure if that's mature enough, but everything I've kept in there so far has lived. I have a male betta in there now, he's not going to be happy when I move him to his soon to be new 5 gallon home.
 

andy305mia

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I have had both filters up and running for about 3 moths now. Not sure if that's mature enough, but everything I've kept in there so far has lived. I have a male betta in there now, he's not going to be happy when I move him to his soon to be new 5 gallon home.
Ok I understand what you're saying now, maybe I should start with 5 and add the other half later...I can also get all 10 and just do water changes with prime every 24 hours for a week or so
 

kallililly1973

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I would add all 10 and test the parameters daily for a week or so and then do WC's as needed. You may need to do a couple but i'de just check the parameters beforehand
 

andy305mia

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I went with 12, I picked them up 4 for $10. They are super tiny tho, but it's ok. Thanks to all!
 
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