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Are Corydoras nocturnal?


Cohen
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Kind of, like a lot of fish species, they rest throughout the day and night in tiny naps. Corydoras are more active (I would say comfortable) at night but its not rare to see them venturing out in the day. 

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Mine are always out during the day, I see them out for a while after the tank lights go off, but I don’t see them out throughout the night.  I’m a bit of an insomniac so I am sometimes seeing the tank at all hours during the night.

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Wow I am actually surprised at how little information there is on the internet about this. While Corydoras like most catfish are primarily active at night, they can be found in the wild swimming in massive schools at all hours of the day, like reverse cats. They have important schedules to adhere to and if they don't comb the South American river basins who will?

 

Even fishbase.org is skimpy on any information on a very popular pet:

https://www.fishbase.de/summary/Corydoras-julii.html

Edited by Biotope Biologist
checked fishbase too
  • Haha 2
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