I'll give you a bit of a run-down of what should happen with your eggs, and alter on fry...
Once the pair has mated, remove the female because the male becomes very aggressive during this period and will probably kill her. Once the babies are born, the father will take care of them, and for about three days as they hatch, return them to the bubble nest for safety. So don't worry if it looks like he is eating them at this point. aAso at this point you should put in some dried crumbled lettuce leaves, and some powdered fish flakes. In 3-4 days the nest will be very small and if you look hard you will see little tiny fish swimming around the top of the tank. In about three weeks the male will start eating the babies if he is not taken out, so once the yolk sacs are gone, this would be a good time to remove the father. you will want your fry aquarium to be about 15 gallons or more, and have about 8 inches of water in it. otherwise in a week or two all you fish will die off. Also you will need to have them in established tank water or they will die if the water is exeptionally clean.(gouramis are used to muddy water) this is what the lettuce and flake food is for. you can make "fish food flour" which is exactly what it sounds like, extremly fine flake food. I don't know if they will eat liquid food though. And yes Infusoria is good food(but you must make a culture of it first) It is also important to keep the tank well covered, and at a constant temp of about 73-75 degrees. if the water gets that film on the top clean it by drawing a piece of newspaper or paper towel across it. Hope that tells you what you need to know. If you have any other questions just ask, because I've breed these guys before a few times.