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So I've been researching into the various species of pygmy cories and it seems like there's a lot of confusion between them. I'm looking for pygmy cories that stay on the bottom of the tank rather than swimming in the middle. Is there such a thing? And how do you tell the different species apart?
 

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all 3 Pygmy types tend to swim all over and not just the bottom - if a true bottom dweller ismwhat you want then this won't be the fish for you.
 

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I agree. Habrosus and hastatus especially are mid to all over the darn tank dwellers. Pygmaeus a little less so, but they are still active happy little guys that swim all over. I think you would be pleased with any of them, to be honest.

Pygmaeus:
http://www.seriouslyfish.com/profile.php?genus=Corydoras&species=pygmaeus&id=333


Habrosus:
http://www.seriouslyfish.com/profile.php?genus=Corydoras&species=habrosus&id=904


Hastatus:
http://www.seriouslyfish.com/profile.php?genus=Corydoras&species=hastatus&id=272



You might consider aspidoras as they seem a bit more "typical" in cory behavior.
 

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I think you're a little confused. The word you're looking for is "dwarf" cories, not pygmy. There are three types of dwarf cories - C. pygmaeus (aka. pygmy), C. hastatus, and C. habrosus. All three share pretty similar traits and personalities.

Behavior-wise, granted they'll swim throughout the water column a lot more than regular cories, they'll still spend the majority of the time either resting on a platform (such as a leaf or hardscape) or on the substrate. They're still not the standard mid-water schoolers like tetras that you're thinking of.
 

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My pygmaeus definetly spend lots of time in the middle of the tank. They only really go to the surface when going for air.

That said they spend more time on the bottom rooting around, and planking in various places. They are amazingly fun little fish.

One cool thing is that they are so small they can plank on off things. Earlier this evening one of mine was planking with his chin on the very tip of one strand of microsword, and his tail tip on another strand, balanced perfectly between them :)
 
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