The fry are now 3 days old and becoming more active. I can see them wriggling and starting to swim a little bit around the nest site. Big Daddy is still being a good father and putting them back in the nest if they drop too far. He's also going hunting through the plants and the bottom of the plants for any that he's missed. I think I am going to remove him tomorrow though as reading through the International Betta Congress's page about them, Betta Coccina don't always continue the good care once the fry are free swimming. I'm also removing him because he hasn't eaten since they spawned, he won't come to the feeding area to eat so I think he will be ready to relax a bit.
The fry are developing, when they first hatched they were basically an egg with a bit of a tail. I can now see eyes and more of a tail. I still can't get over how tiny they are.