I've had a pair of kribs for a couple months now. They are both nice-looking adults - not quite fully-grown but certainly close to being so. They're in a planted 45 gallon with a few (very peaceful and calm) female bettas and some small angelfish, as well as one male guppy. Everyone gets along perfectly - the kribs are the most aggressive of them all, but the chases are only mildly territorial: short lived and and not intended to harm. The male and the female never fight, and always swim together. I'm not sure if these are breeding colors or simply the look of happy kribs, but it seems as though the pair constantly seeks to amaze anyone watching with their coloring. The female's belly turns bright red, the yellow on her body and fins really begins to pop, and the rest of her body becomes almost black. The male's black and yellow also get much darker (his "yellow" is more like a fiery orange) and pop against the grey markings, but he doesn't become as dark as the female. His stomach also turns faintly pink. I am sure I have a male and a female, and I'm not necessarily looking to breed them, but their behavior is certainly interesting, and these colors are breathtaking. I'd say that they display like this 80% of the time, but I've never seen eggs laid though the female does become plumper on occasion. I was just wondering if it was common for kribs to show these awesome colors as often as mine do! Regardless, I'm hoping it means I'm doing something right as their caretaker! Thanks.