From point of laying, it takes an average of 3 days befire hatching. The wriggler stage lasts a further 4-5 days. They are then free swimming after they have absorbed thier yolk sac. You should start feeding them fine foods such as daphina/cyclops/baby brine shrimp etc. When larger, you will know on instinct to move them up to larger foods such as crushed flakes, chopped bloodworms and frozen baby brine shrimp.