Angel Fish Fry

I have been breeding Angel Fish for Quite some time and I never had any problems. For the past 4 months I have been unable to breed any angels. I am doing something wrong and I don't know what it is. The eggs are taken from the parents and put in a jug in a tank. The fish become wigglers and then become fry. They last seven days from the time they were laid and then die. I use H202 10 drops the first day and then do a 100% water change the second day I use 5 drops and do a 30% water change. From then on I do a 30% water change with aged water once a day. By the 7th day they are all dead. My water tests fine, I do have hard water. When I change the water I go through the jug with an eye dropper and pick out all the dead fry. The live fish are then put back in the jug. If I have any live angels on the 7th or 8th day, I then put them in a 2.5 or 5.5 gallon tank with aged water and declore. Buy this point most of the Fry if not all are dead. Thanks for your help.