Congratulations on the spawn.
They will be able to take fresh hatched brine shrimp within a week, within 3 weeks they will start eating the smaller and weaker siblings and chopped bloodworms, within a month they will be able to take adult brine shrimp and whole bloodworms. Morgurndas grow fast and are incredibly greedy, expect only around 1/3 of the spawn to survive, the rest will fall to canabalism.