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Has anyone had either Corydoras Adolfoi, Pygmaeus, or Hastatus cories?
I have been researching all types but those are the ones I'd like to know more about.

I have some pygmys. Granted, I've only had them about 3 weeks or so.

Anyway, I've noticed that they are just as active as the other common corys. They have a reputation of being mid-water swimmers, and while mine do spend a little time off the bottom, it was not as much as I expected. However, this could be due to not having any kind of mid-water schooler like a tetra or rasbora for them to be with. If I recall correctly, these guys are often intermixed with some sort of characin in the wild.

They also have a reputation for being touchy, chemistry-wise. I can tell you that they don't much mind where your pH and hardness levels are. My pH is up around 8 with a moderately-high hardness, and they seem to be quite happy. Not sure about how they react to nitrogen compounds, but then again you shouldn't really be testing them on that anyway!

I guess the most important point is that they are as cute as all get-out.

Yep, Pygmaeus cories like to swim with mid-water schoolers. And they're nitrate sensitive.

I vote! Do you?