Males: Very dull colored, unless in breeding condition( like the one in your avatar ). They are a dull grey color, with extended fin's, and a torpedo shaped body. Their pelvic fins are blue-ish purple.
Females: Brightly colored, even when not in breeding condition. Their stomach is distended, like they ate a little to much. It is usually cherry red, but can sometimes be purple. Their pelvic fins are the color of their stomach. Their fins are rounded, and when breeding, can be a brilliant gold color.
Note: That is not my female Kribensis. But the one in my avatar is.