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.
Regimen is a noun. The word regiment, when used as a noun, refers to an army unit that usually involves two battalions. Regiments may be further divided into companies, squadrons, or batteries. Regiment may also be used figuratively to describe an organized arrangement of things or people. Regiment is also a verb which means to bring strict order, to discipline in an oppressive manner.