While it is possible that the parents ate the eggs, or let other fish eat the eggs, take a close look around the tank. Attentive angelfish parents will often move the eggs. Look at other flat surfaces, both vertical and horizontal, for the wiggling eggs. You may find them stuck to the heater or sides of the tank.
Regimen: A plan or a regulated course, such as a diet, exercise, or treatment, that is designed to give a good result. A low-salt diet is one type of dietary regimen.
agon. an ancient Greek term used to denote the fundamental conflict in any drama. Agon also is the term used for a theatrical convention typically associated with Old Comedy where the chorus is divided into two halves to debate an important idea or political question that relates to the major themes of the play.