Back when I had my pair in a 55 true, they spawned regularly but the fry usually got eaten, I have 1 surviving fry from all of their 5 seen spawns because of the community setting the tank was in. IME both genders shimmy, the female would do it more though.
Very nice pair of kribs there! The female is very colorful but the male does not seem to be showing breeding dress yet, you will be able to tell when that happens, they become such vibrant fishes around then. I should have a picture somewhere if you are interested.