Is this the first time they laid eggs for you? If so, then it is likely that they ate the eggs. Kribs usually will eat their eggs the first couple times. After they get the hang of it, they make excellent parents. But, I would separate them from all the other fish since they do get very aggressive when protecting their eggs/babies. My kribs killed 10 of my diamond tetras before I realized they were the problem and removed the male kribs.