By coeruleus and lentiginosus it will take 3 days until the eggs will hatch, normaly does a warmer temperature gives a faster result of hatching of the eggs. I think by a temperature of 26 to 28C it will take 3 days.
From larve to free swimmer it will take 7 to 8 days
Than can you feed them with small food.. mostly they find food enough in the tank when they are by the parents.
Good news that you have eggs now of your coeruleus, it's a learning process for the fish and for the fishkeeper
Good luck with them!