As they grow, they've become more adventuresome, swimming toward the surface of the water and leaving the school to explore as individuals.
In about four weeks, they should be large enough to sell. While some angelfish breeders sell them when their bodies are the size of a dime, I believe this is entirely too young; the mortality rate is high at that size when they are moved to different water conditions. I prefer to keep them until their bodies are the size of a quarter or larger, to give them a better chance at surviving and flourishing.
Kept in the right conditions, angelfish can live to be 10 years old.