For the past two months, they have shown little interest in laying more eggs. It turns out that angelfish often will breed every two weeks for several months and then stop for several weeks or months.
While they've been on a break, their last batch of angels have been growing larger and stronger. I can tell that at least three of them are males. How? Males tend to grow larger than females. They also tend to become more territorial at a younger age, often chasing the other males out of their area - which sometimes they think of as the entire tank.
Next week, these angels will go to the pet shop in Lumberton, North Carolina. I'm told they can tell the difference between my angels and other breeders because mine have higher fins and grow larger. I believe that's due to the fact that I never overcrowd them. Angels with short fins and stunted growth are often grown in smaller, crowded tanks.