I pull the eggs as soon as the pair is done doing their thing. I have about 300 growing right now from a pair. They have successfully fertilized 3 batches. I didnt need anymore so I let them tend to their next eggs on their own and they ate them prior to wiggler stage. They are in a community tank so that may have something to do with it. Artificially raising them is not that hard and better than waiting for the pair to figure it out.