Im going to have to agree with with indigoj in this case. Kribs fry, even though they are rather large as far as cichlid fry are concerned, will be eaten by anything fast swimming. They kribs can fight off the slower fish, but with that many fish in your tank, after the first week of them hatching, you'd be lucky to have over 15 percent of the fry left. The fish can't protect they fry 24/7 with that many fish in there. Especially when the lights go out.
Besides that, your tank has horrible stocking. Before you try breeding anything, you need to situate your tanks. If you have a 700 L avalible, then move the acaras. The tank they are in is not near big enough. And when you say " I will move them when they get to big". What is "too big" for you? When they hit 4 inches? When they start killing/bullying eachother?
I wouldn't breed anything until you get your tanks sorted out, if I were you.