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I keep c. habrosus and c. pygmaeus and habrosus is my favorite of the two. I've never actually seen c. hastatus in a LFS, but they may be more common in other places. Just know that they like larger schools than standard cories, like 6 - 10. They can be pretty active too, mine are in a 29 g and are all over the place all the time. Also, when you go to purchase its good to get fish that have bee at your LFS for a week or more. As they are so small, they can get sick more easily from shipping, often with a cory specific disease. My LFS, which sells very good quality stock and has clean tanks, has had more than one batch shipped in that half the fish have sickened after a few days in the store. But the ones I've had besides that have been hardy in my home tank. Hope that helps!