I have two groups of Krobia sp. 'Xingu Orange'. I keep them like I do severums -- temp in the low 80s, frequent water changes, variety of foods including pellets, frozen, and freeze-dried worms... Mine can be quite shy so they do best with tankmates, but make sure you don't put them with anything too rowdy. I keep them with sevs, Geos, festivums, some larger angelfish, things like that.
I've had my first group of 4 for two years and although I've seen breeding tubes and spawning colors, they never have actually laid eggs. They're 5" or so, the males may be a bit bigger. My second group from Jeff Rapps has been here for a couple months and they're in the 3" range now. They're a lot more aggressive and outgoing than my first group.