You have to seperate them from the other fish if you want to have a chance at the eggs hatching.
Most bird eggs incubate at approximately 99-100 degrees. It is doubtful the mom will get maternal but it never hurts to try. Just make sure she doesn't feel threatened by it and try to hurt it. Good Luck.
Ok what are your parameters? the ph should be around 7.0 to 7.5 at the most when breeding angels and it is better if the water is soft. I use a RO(reverse osmosis)system to soften my water for breeding. how do your eggs look after a day or two? white...